In kinematics, the speed of an object is the magnitude of its velocity (the rate of change of its position); it is thus a scalar quantity. The average speed of an object in an interval of time is the distance traveled by the object divided by the duration of the interval;^[1] the instantaneous speed is the limit of the average speed as the duration of the time interval approaches zero .

Like velocity, speed has the dimensions of a length divided by a time; the SI unit of speed is the meter per second, but the most usual unit of speed in everyday usage is the kilometer per hour or, in the USA and the UK, miles per hour. For air and marine travel the knot is commonly used.

The fastest possible speed at which energy or information can travel, according to special relativity, is the speed of light in vacuum c = 299,792,458 meters per second, approximately 1079 million kilometers per hour (671,000,000 mph). Matter cannot quite reach the speed of light, as this would require an infinite amount of energy. In relativity physics, the concept of rapidity replaces the classical idea of speed. In day-to-day athletics, it is proper to say that a teenager can achieve atleast 20 kmph (or 12.43 mph) of speed while a best runner can achieve 30 kmph (or 18.64 mph) which is similiar to run 100m running race in about 12 seconds. The average speed for a teenager is 24 kmph, which can be a result on running 100m in 15 seconds.

Definition[link]

The speed v is defined as the magnitude of the velocity v, that is the derivative of the position r with respect to time:

Failed to parse (Missing texvc executable; please see math/README to configure.): v = \left|\mathbf v\right| = \left|\dot {\mathbf r}\right| = \left|\frac{d\mathbf r}{dt}\right|.

If s is the length of the path traveled until time t, the speed equals the time derivative of s:

Failed to parse (Missing texvc executable; please see math/README to configure.): v = \frac{ds}{dt}.

In the special case where the velocity is constant (that is, constant speed in a straight line) this can be simplified to v=s/t. The average speed over a finite time interval is the total distance traveled divided by the time duration.

Expressed in graphical language, the slope of a tangent line of a distance-time graph is the instantaneous speed, and the slope of a chord line of distance-time graph is the average speed over the time interval between the ends of the chord.

Units[link]

Units of speed include:

• meters per second (symbol m s⁻¹ or m/s), the SI derived unit;
• kilometers per hour (symbol km/h);
• miles per hour (symbol mph);
• knots (nautical miles per hour, symbol kn or kt);
• feet per second (symbol fps or ft/s);
• Mach number (dimensionless), speed divided by the speed of sound;
• in natural units (dimensionless), speed divided by the speed of light in vacuum (symbol c = 299,792,458 m/s).

(Values in bold face are exact.)

Examples of different speeds[link]

Vehicles often have a speedometer to measure the speed they are moving.

See also[link]

Look up speed or swiftness in Wiktionary, the free dictionary.

• Air speed
• Land speed
• List of vehicle speed records
• Speedometer
• Typical projectile speeds
• V speeds

References[link]

• Richard P. Feynman, Robert B. Leighton, Matthew Sands. The Feynman Lectures on Physics, Volume I, Section 8-2. Addison-Wesley, Reading, Massachusetts (1963). ISBN 0-201-02116-1.

Wikiquote has a collection of quotations related to: Speed

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Selena Gomez
Gomez attending "The 6th Annual Hollywood Style Awards", Beverly Hills, CA on Oct. 10, 2009
Background information
Birth name	Selena Marie Gomez
Born	(1992-07-22) July 22, 1992 (age 19) Grand Prairie, Texas, U.S.
Genres	Pop, dance, pop rock[1]
Occupations	Actress, singer, Fashion Designer
Instruments	Vocals, piano, guitar, drums
Years active	2002–present
Labels	Hollywood
Associated acts	Selena Gomez & the Scene, Demi Lovato, Taylor Swift
Website	SelenaGomez.com

Selena Marie Gomez (born July 22, 1992)^[2] is an American actress and singer best known for portraying Alex Russo in the Emmy Award-winning Disney Channel television series Wizards of Waverly Place. She subsequently ventured into feature films and has starred in the television movies Another Cinderella Story, Wizards of Waverly Place: The Movie, and Princess Protection Program. She made her starring theatrical film debut in Ramona and Beezus.

Her career has expanded into the music industry; Gomez is the lead singer and founder of the pop band Selena Gomez & the Scene, which has released three RIAA Gold certified studio albums, Kiss & Tell, A Year Without Rain, and When the Sun Goes Down, spawned three RIAA Platinum certified singles, "Naturally", "Who Says" and "Love You Like a Love Song" and charted four No. 1 Billboard Hot Dance Club Songs.^[3] Gomez has also contributed to the soundtracks of Tinker Bell, Another Cinderella Story, Wizards of Waverly Place, and Shake It Up after signing a record deal with Hollywood Records.

In 2008, Gomez was designated a UNICEF Goodwill Ambassador.^[4]

Early life[link]

Gomez was born in Grand Prairie, Texas.^[2] She is the daughter of former stage actress Amanda Dawn "Mandy" Teefey (née Cornett) and Ricardo Joel Gomez.^[5][6][7] Her father is of Mexican ancestry, and her mother is of part Italian descent.^[8][9] Regarding her Hispanic heritage, Gomez said: "My family does have Quinceañeras, and we go to the communion church. We do everything that's Catholic, but we don't really have anything traditional except [that we] go to the park and have barbecues on Sundays after church."^[10] Her birth parents divorced when she was five years old, and she was raised as an only child by her working mother.^[5][11] In 2006, Mandy remarried Brian Teefey.^[12] She was named after Tejano singer Selena, who died almost three years after Gomez was born.^[13] In a 2009 interview with People, Gomez mentioned that she developed an early interest in acting from watching her mother prepare for and act in theater productions.^[11] She earned a high school diploma through homeschooling in May 2010.^[14]

Career[link]

[edit] 2002–06: Barney & Friends and early work

Gomez began her acting career at age seven, playing Gianna on Barney & Friends.^[15] She later had minor roles in Spy Kids 3-D: Game Over and the TV film Walker, Texas Ranger: Trial By Fire. Gomez also starred in the television movie Brain Zapped. (Selena Gomez also found out that she wanted to be an actress because in E Special she states that "I would also watch my mom on stage do her lines".)

In 2004, Gomez was discovered by the Disney Channel in a USA-wide scouting.^[16] Gomez appeared as a guest star on The Suite Life of Zack & Cody and had a guest appearance – that later turned into a recurring role – on Hannah Montana from seasons two to three. Gomez previously taped two different pilots that were spin-offs to two previous Disney series.^[17] The first one, What's Stevie Thinking?, was the spin-off to Lizzie McGuire. Gomez played Stevie Sanchez, Miranda Sanchez's little sister. The other show was titled Arwin!, the spin-off to The Suite Life of Zack & Cody, in which she played Alexa. Neither series was picked up.

[edit] 2007–09: Wizards of Waverly Place and Selena Gomez & The Scene

Gomez on the studio set of Wizards of Waverly Place before filming an episode for the show's first season in April 2007

In early 2007 Gomez was cast in the Disney Channel series Wizards of Waverly Place as one of the three main characters, Alex Russo. The show premiered to an audience of 5.9 million, becoming a hit. Many news outlets began dubbing Gomez the next 'Miley Cyrus' causing some controversy and a reported 'feud'. Gomez clarified that there was no feud and that she was flattered by the comparison, saying: "It's a little overwhelming, but I think really, it's a compliment. She's obviously extremely successful, and I think she's a wonderful performer ... So being compared to her, I was very, very flattered."^[18] Gomez recorded four songs, one of which was a cover, for theWizards of Waverly Place soundtrack, only one single (Magic) from the album was released.

In 2008, Gomez recorded a cover of "Cruella de Vil"—which included a music video—for the compilation albumDisneyMania 6. Gomez also recorded "Fly to Your Heart" for the 2008 animated film Tinker Bell. In July 2008, before Gomez' sixteenth birthday, she signed a recording deal with Hollywood Records, a music label owned by Disney.^[19] In May, of the same year, Gomez was featured, with Forever the Sickest Kids, on a duet version of the non-album song "Whoa Oh!".^[20] The same year Gomez appeared in Another Cinderella Story, the direct-to-DVD sequel to the 2004 Hilary Duff film, opposite Drew Seeley. She also had a minor voiceover role as one the Mayor's ninety-six daughters in Horton Hears a Who! which released in March of that year. In April, Lacey Rose, of Forbes ranked Gomez as being fifth on their "Eight Hot Kid Stars To Watch" list; and Rose described Gomez as having been "a multitalented teen".^[21] Gomez recorded three songs for the movie's soundtrack.

In 2009, Gomez formed the teen pop band Selena Gomez & the Scene. Kiss & Tell, the band's debut studio album and was released on September 29, 2009 by Hollywood Records. On March 5, 2010, the album was certified Gold by RIAA.^[3] The album's single, "Naturally", was certified Platinum by the RIAA on July 15, 2010.^[3] In February 2009, Gomez signed on to star as one of the two female leads in Ramona and Beezus, a film adaption of the children's novel series by Beverly Cleary.^[22][23] Gomez stated that she felt no pressure in taking more adult roles: "I think I’m fully aware of my audience and I’m still just a kid myself. I wouldn’t do a role I don’t feel comfortable doing or that my audience wouldn’t feel comfortable seeing."^[24]

In June 2009, Gomez did a guest appearance as herself in one episode of best friend Demi Lovato's Disney Channel television show, Sonny with a Chance, entitled "Battle of The Network Stars". That same month Gomez appeared alongside Lovato in the made-for-television Disney Channel movie, Princess Protection Program.^[25] The telecast garnered 8.5 million viewers becoming, at the time, the third most watched Disney Channel Original Movie.^[26] One month later, Gomez, along with two cast members of Wizards of Waverly Place appeared in a television three-way cross-over episode with Hannah Montana and The Suite Life on Deck, entitled Wizards on Deck with Hannah Montana.

On August 28, 2009 two months after appearing in Princess Protection Program, Gomez starred in Wizards of Waverly Place: The Movie, a made-for-television film based on the show.^[27] The film premiered to an audience of 11.4 million viewers becoming cable's No. 1 scripted telecast of 2009 and Disney Channel's second most-viewed film premiere after High School Musical 2.^[28] In September 2009, Wizards of Waverly Place won "Outstanding Children's Program" at the 61st Primetime Emmy Awards.^[29] In 2010, the film adaptation won the series its second consecutive Emmy for "Outstanding Children's Program" at the 62nd Primetime Emmy Awards.^[29]

[edit] 2010–2011:Theatrical film debut, A Year Without Rain and When The Sun Goes Down

Gomez on location in Paris, France filming Monte Carlo in June 2010

Gomez's first theatrical film Ramona & Beezus premiered on July 23, 2010 and met with generally positive reviews.^[30] In March 2010, Variety reported that Gomez was set to star as one of the three lead roles in Monte Carlo, alongside Leighton Meester and Katie Cassidy.^[31] In the film Gomez plays Grace, a girl who’s “mistaken for a socialite while on a trip to Paris.”^[32] To prepare for the role Gomez learned how to play polo and also took two weeks of vocal training to learn two different British accents.^[33][34] The same year Gomez confirmed that the fourth season of her hit Disney Channel show, Wizards of Waverly Place, would be its last.

Gomez performing at the 2011 MuchMusic Video Awards.

On September 17, 2010 , Selena Gomez and The Scene released their second studio album, A Year Without Rain The record debuted on the Billboard 200 at number 4, selling 66,000 copies. On January 19, 2011, the album was certified Gold by RIAA.^[3] As of April 2011, the band has sold 1,354,000 albums in the United States.^[35] To support the album, the band embarked on the mini-tour A Year Without Rain Tour. In February 2011, Deadline.com reported that Universal Pictures and Strike Entertainment had acquired the novel Thirteen Reasons Why by Jay Asher with Gomez attached to the lead.^[36] That same month TV Guide reported that Gomez would make a cameo in the Muppets film.^[37] On March 23, 2011, Hollywood Records announced through a press release that Selena Gomez & The Scene would be embarking on their third concert tour in the United States, the We Own the Night Tour ran during the summer of 2011.^[38] Production for the final season of Wizards of Waverly Place came to a wrap on May 14, 2011.^[39] Gomez co-hosted the 2011 MuchMusic Video Awards on June 19.^[40] She also hosted the 2011 MTV EMAs on November 6, 2011, in Belfast, Northern Ireland, where she performed her band's single "Hit the Lights". Near the end of 2011, it was reported Gomez was in talks to star in two upcoming films. Deadline.com announced in October that Gomez would take part in the comedy Hot Mess.^[41]

In early November, Variety reported that Gomez was in talks to star in the upcoming film Spring Breakers alongside James Franco and Vanessa Hudgens.^[42] Gomez confirmed to MTV that she had signed on for the project and that production will begin in early 2012.^[43] On June 28, 2011, Selena Gomez & the scene released their third studio album, When the Sun Goes Down, previously titledOtherside,^[44] The album debuted at number 4 on the Billboard 200, selling 78,000 copies its first week and the following week, the album rose to number 3 on the Billboard chart, becoming the band's highest charting album to date.^[45][46] On November 17, 2011, the album was certified platinum.^[3] The album's lead single, "Who Says" was certified Platinum by RIAA on June 23, 2011 and has become the band's highest charting song on the Billboard Hot 100 to date, peaking at number 21.^[3][47] The second single, "Love You Like a Love Song", was certified Platinum by RIAA on December 2, 2011, and became the act's first to sell over two-million copies.^[3][48]

2012–present: Focus on film[link]

In January 2012, Gomez announced that she would put her music career on hold.^[49] This was later reaffirmed as Gomez wrote on her Facebook page that she was taking a break from music in order to focus on her acting career, "my band and I are going our separate ways for a while. This year is all about films and acting and I want my band to play music wherever with whoever. We will be back but, it will be a good while."^[50] In February 2012, Gomez announced that the band would be taking a hiatus, so that she could focus on film for the year. She encouraged her band mates to work with other artists during the hiatus.^[51] The same month, it was announced that Gomez will replace Miley Cyrus in the animated comedy Hotel Transylvania playing Mavis, the daughter of Dracula who will be voiced by Adam Sandler.^[52] As of March 2012, Gomez has been cast in four upcoming films; in which three of them she has been cast as a lead role. She will first appear in Hotel Transylvania, an animated film, voicing the character of Mavis, who was originally supposed to be voiced by Miley Cyrus, however Cyrus dropped out of the film in early 2012 in order to focus on her music career.^[53] The film is scheduled to be released on September 21, 2012.^[54] Next, Gomez will appear in Spring Breakers, which is currently being filmed on location in Sarasota, Florida. The film is being written and directed by Harmony Korine.^[55] Gomez has also been cast as the main role of Hannah Baker in the film adaptation of young-adult fiction novel, 13 Reasons Why. The novel was written by Jay Asher.^[56] She will also play the lead role in a film called Hot Mess, a comedy film directed by Dave Meyers.^[56] On April 7, 2012, Gomez posted a video for fans in which she revealed that she will be filming a new movie called "The Getaway" in Bulgaria. ^[57]

Other projects[link]

Philanthropy[link]

Selena Gomez performs at the KISS 108 Jingle Ball in December 2010

Gomez was involved in the UR Votes Count campaign which encouraged teenagers to learn more about 2008 presidential candidates Barack Obama and John McCain.^[58] In October 2008, Gomez participated in St. Jude's Children's Hospital "Runway For Life" benefit.^[59] Gomez is a spokesperson for Borden Milk; she is featured in the campaign's print and television ads.^[60] She is the ambassador of DoSomething.org after being involved with the charity Island Dog, which help dogs in Puerto Rico.^[61] She got involved while filming Wizards of Waverly Place: The Movie in Puerto Rico.^[62] Gomez is a spokesperson for State Farm Insurance, and is featured in their TV commercials; which air on the Disney Channel, to raise awareness of being a safe driver.^[63] Gomez is also involved with the charity RAISE Hope For Congo, an initiative of the Enough Project, which helps raise awareness about conflict minerals and violence against Congolese women.^[64]

In October 2008, Gomez was named UNICEF's spokesperson for the Trick-or-Treat for UNICEF campaign, which encouraged children to raise money on Halloween to help children around the world.^[4] She said that she was "extremely excited" to "encourage other kids to make a difference in the world."^[4]

In August 2009, a 17-year-old Gomez became the youngest UNICEF ambassador ever, passing fellow songstress Hayley Westenra, who was 18 when she was chosen. In her first official field mission, Gomez traveled to Ghana on September 4, 2009 for a week to witness first-hand the stark conditions of vulnerable children that lack vital necessities including clean water, nourishment, education and healthcare.^[65][66] Gomez explained during an interview with Associated Press that she wanted to use her star power to bring awareness to Ghana: “That’s why I feel very honored to have a voice that kids listen to and take into consideration [...] I had people on my tour asking me where IS Ghana, and they Googled it [...] and because I went there, they now know where Ghana is. So it’s pretty incredible.”^[66][67] Gomez said of her role as ambassador that: "Every day 25,000 children die from preventable causes. I stand with UNICEF in the belief that we can change that number from 25,000 to zero. I know we can achieve this because every moment, UNICEF is on the ground providing children with the lifesaving assistance needed to ensure zero becomes a reality."^[65]

Gomez was named spokesperson for UNICEF's 2009 Trick-or-Treat campaign, for the second year in a row.^[68] Gomez, who raised over $700,000 for the charity in 2008, stated that she hopes to be able to raise 1 million dollars in 2009.^[66] Gomez participated in a celebrity auction^[69] and hosted a live web cast series on Facebook in support of the Trick-or-Treat for UNICEF campaign.^[70] Gomez returned as the UNICEF spokesperson for the 60th anniversary of Trick-or-Treat for UNICEF campaign in 2010.^[71] In celebration of the 60th anniversary, Gomez and her band, The Scene, held a benefit concert donating all proceeds to the campaign.^[72]. On January 22nd 2010, Gomez participated in the Hope for Haiti Now Telethon with a number of other celebrities^[73].

In February 2011, Gomez traveled to Chile to witness and meet with the families of UNICEF's supported program, "Programa Puente" which helps families better understand and develops skills to deal effectively with early childhood education, development and other issues related to raising children. From her field trip experience, Gomez said "UNICEF is helping Chilean families get out of poverty, prevent violence within the home and promote education. To witness first hand these families' struggles, and also their hope and perseverance, was truly inspiring."^[74] In March 2011, Gomez participated in the UNICEF Tap Project's "Celebrity Tap Pack," limited-edition, custom-made water bottles featuring tap water from the homes of each celebrity advocate, in order to raise funds and increase profile for the clean water and sanitation programs.^[75] She is also featured in videos promoting the campaign.^[76][77]

Gomez is involved in Disney's Friends for Change, an organization which promotes "environmently-friendly behavior", and appears in its public service announcements.^[78] Gomez, Demi Lovato, Miley Cyrus, and the Jonas Brothers recorded "Send It On", a charity single with all of its proceeds to the Disney Worldwide Conservation Fund.^[79][80] It debuted on the Billboard Hot 100 at number 20.^[79] Also in 2009, Gomez made a surprise visit to a Los Angeles elementary school as part of the "A Day Made Better" program that was sponsored by OfficeMax. During her visit, Gomez gave the school an award and $1,000 worth of school supplies, and talked to students about the importance of giving back to the community.^[81][82]

Gomez is also the owner of six rescue dogs and describes herself as a "huge animal-lover".^[83]

In April 2012, Gomez was named ambassador to the Ryan Seacrest Foudation^[84].

Entrepreneurship and sponsorships[link]

Gomez was part of Sears back-to-school fashion ad campaign.^[85] As part of the campaign Gomez was featured in the television commercials. In August 2009, Gomez also hosted the "Sears Arrive Air Band Casting Call" – to select five people for the first-ever "Sears Air Band", which performed at the 2009 MTV Video Music Awards.^[86]

In October 2008, Gomez launched her own production company, July Moon Productions, and partnered with XYZ Films to create star vehicles for Gomez. As part of the agreement Gomez will have the opportunity to be able option articles, hire writers and create talent packages to shop to studios.^[87][88] Also, as part of the deal, "XYZ Films will allow Gomez to star in and produce at least two films.^[81] Variety reported that: "In August, XYZ [Films] inked a similar deal with Time Inc. and management-production company the Collective to finance the development of the print media giant's content for the bigscreen [...] As part of the July Moon-XYZ deal, [Selena] Gomez will have the ability to cherry-pick projects from the vast Time Inc. library, which includes Time, Sports Illustrated, Fortune and Life."^[88]

In October 2009, Gomez announced her plan to launch her own fashion line, called "Dream Out Loud by Selena Gomez". The clothing line launched in the fall of 2010.^[89][90] The collection consists of and features bohemian dresses, floral tops, jeans, skirts, jackets, scarves and hats, all made from recycled or eco-friendly materials.^[91][92] Gomez said that the line will reflect her own personal style and described the clothing as being "pretty, feminine, and bohemian," and: "With my line, I really want to give the customer options on how they can put their own looks together [...] I want the pieces that can be easy to dress up or down, and the fabrics being eco-friendly and organic is super important [...] Also, the tags will all have some of my inspirational quotes on them. I'm just looking to send a good message."^[89][92] Gomez, who has no background in fashion, teamed up with designers Tony Melillo and Sandra Campos, both who have worked with big-name fashion houses.^[90] Gomez said of the partnering: "When I met Tony and Sandra, I was instantly comfortable with them and now they are just like family to me ... They are so creative and I love how I can just call them up whenever and talk to them about everything, even if it's just about changing a button ... They've been so cool about everything."^{[89][90][91][92]} The brand will be manufactured by, Melillo and Campos teamed with New York-based Adjmi Apparel and formed by Adjmi CH Brands LLC; which is the holding company for the brand.^[93]

It was announced on July 14, 2011, that Gomez had signed a license agreement with Adrenalina, an extreme sports and adventure-themed lifestyle brand, to develop, manufacture, and distribute the actress' fragrance. It is expected to debut in May of 2012. Chairman and C.E.O. of Adrenalina, Ilia Lekach, said, "We are incredibly enthused to be working with Ms. Gomez and will reveal more details pertaining to the fragrance as we get closer to the launch date."^[94]

Personal life and Image[link]

With a solid fan and media following, Selena Gomez is considered a teen idol. She has appeared on several magazine covers, including People Magazine,^[95] Cosmopolitan,^[96] Billboard,^[97] TVGuide,^[98] Teen Vogue,^[99] Seventeen,^[100] Elle^[101].

Wax statues of Gomez are on display at Madame Tussauds wax museums in New York^[102], London^[103], Washington D.C^[104] and Hollywood.

Relationships[link]

Gomez has had several high-profile relationships. She had an on-off relationship with singer Nick Jonas of the Jonas Brothers from 2008 to 2010.^[105] In 2009, she met actor Taylor Lautner in Vancouver, while she was filming Ramona and Beezus and he was shooting New Moon^[106], and the two dated for almost a year. However the pressure of the media became too much for them and caused the two to break-up.^[107] On February 27 2011, Gomez attended the 2011 Vanity Fair Oscar Party with Canadian singer Justin Bieber,^[108] confirming several months of media speculation about a romantic relationship between the pair.^{[109][110][111][112][113][114]} The relationship has since continued to garner significant media attention.^{[115][116][117][118][119]}

Filmography[link]

Film[link]

Television[link]

Discography[link]

Albums

• 2009: Kiss & Tell
• 2010: A Year Without Rain
• 2011: When the Sun Goes Down

Soundtrack albums[link]

Singles[link]

Featured singles[link]

Other charted songs[link]

Music videos[link]

Tours[link]

Rankings[link]

Awards and nominations[link]

Main article: List of awards and nominations received by Selena Gomez

References[link]