Physics

posted by .

A track star in the long jump goes into the jump at 12 m/s and launches herself at 20.0° above the horizontal. How long is she in the air before returning to Earth? (g = 9.81 m/s2)

  • Physics -

    Vo = 12m/s[20o]
    Xo = 12*cos20 = 11.28 m/s.
    Yo = 12*sin20 = 4.10 m/s.

    Y = Yo + g*Tr = 0 @ max. ht.
    4.10 - 9.8Tr = 0
    -9.8Tr = -4.10
    Tr = 0.419 s. = Rise time.

    Tf = Tr = 0.419 s.

    T = Tr + Tf = 0.419 + 0.419 = 0.838 s.=
    Time in air.

  • Physics -

    13m

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Physics

    A jumper in the long-jump goes into the jump with a speed of 10m/s at an angle of 30 degrees above the horizontal. Use g=10m/s. a) how long in the air is the jumper before returning to the Earth?
  2. Physics

    A jumper in the long-jump goes into the jump with a speed of 10m/s at an angle of 30 degrees above the horizontal. Use g=10m/s. a) how long in the air is the jumper before returning to the Earth?
  3. Physics

    A track star in the long jump goes into the jump at 12 m/s and launches herself at 20 degrees above the horizontal. How long is she in the air before returning to Earth?
  4. physics

    please show me how to do this in steps. A track star in the long jump goes into the jump at 12 m/s and launches herself at 20.0degrees above the horizontal. What is the magnitude of her horizontal displacement?
  5. physics

    please tell me if these are correct A track star in the long jump goes into the jump at 12 m/s and launches herself at 20.0 deg above the horizontal. What is the magnitude of her horizontal displacement?
  6. physics

    A track star goes in the long jump at 10 m/s at 37 degrees above the horizontal. What is the magnitude of the horizontal displacement?
  7. Physics

    A trackstar in the long jump goes into the jump at 12 meters per second and launches herself at 20 degrees how long is she in the air
  8. science

    A ski jumper launches from a ski jump that is oriented parallel to a hill. The jump has a vertical drop of 50 m and the coefficient of friction μ between the skier and the jump is 0.05. The launch point is 5 m above the hill and …
  9. physics

    A ski jumper launches from a ski jump that is oriented parallel to a hill. The jump has a vertical drop of 50 m and the coefficient of friction μ between the skier and the jump is 0.05. The launch point is 5 m above the hill and …
  10. 5th Grade Math

    Jason and Doug competed in the long jump at a track meet. Jason long jump was 98 inches. Doug long jump was 3 yards. How much longer was Doug jump than Jason Jump?

More Similar Questions