# physics

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?

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2. 👎
3. 👁
1. 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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👤
bobpursley

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