physics

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A car is parked near a cliff overlooking the
ocean on an incline that makes an angle of
21.7◦ with the horizontal. The negligent driver leaves the car in neutral, and the emergency brakes are defective. The car rolls from rest down the incline and has a velocity 20 m/s when it reaches the edge of the cliff. The cliff is 19.5 m above the ocean. The acceleration of gravity is 9.8 m/s. How far is the car from the base of the cliff
when the car hits the ocean?

  • physics -

    figure the time to go to the bottom

    Hf=hi+vi*t+1/2 g t^2
    0=19.5-20sin21.7 t -1/2 g t^2
    solve for t.

    how far? distance= 20cos21.7 * t

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