Posted by Prady Manepalli on .
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 
bobpursley,
figure the time to go to the bottom
Hf=hi+vi*t+1/2 g t^2
0=19.520sin21.7 t 1/2 g t^2
solve for t.
how far? distance= 20cos21.7 * t