1,700 kg car coasts down a hill starting from rest and decreases its height by 22 m over a distance of 110 m of travel. How fast will it be going at the end of the hill, if friction has no effect in slowing its motion? I have the answer I just need to know how to work it out the answer is 21m/s
I just need help explaining my answer please

Question

1,700 kg car coasts down a hill starting from rest and decreases its height by 22 m over a distance of 110 m of travel. How fast will it be going at the end of the hill, if friction has no effect in slowing its motion? I have the answer I just need to know how to work it out the answer is 21m/s
I just need help explaining my answer please

anonymous · Answer

use one of the equations of motion, v = u + at i believe.

anonymous · Answer

so how would you do that

anonymous · Answer

The gain in kinetic energy, (1/2)m v^2 
= the loss in potential energy, m g h.
Solve for v. 
Height crucial, distance irrelevant.