Question

A roller coaster starts from rest at the top ofan 18m hill.

Answer 1

Answer:

v= 12.522 m/s

Explanation:

Supposing we have to find the velocity of the car

By conserving energy we can say that

Initial potential energy= Final potential energy + Final kinetic energy

So

$mgh_{initial}=mgh_{final}+0.5mv^2$

also h{initial}=18 m

h_{final}=10 m

therefore,

0.5mv^2=mg(18-10)

So

$v=\sqrt{16g}$

v= 12.522 m/s