Question

A train is travelling up an a 3.73 degrees incline at a speed of 3.25m/s when the last car breaks free and begins to coast without friction.

How long does it take for the last car to come to rest momentarily?

Answer 1

Do you have the mass of the car? if yes it is simple then, you can use the equation: V=at+V0 You know that V0=3.25m/s and V is equal to zero (it stops at the end) so you only need to find the acceleration a (which must be negative) using Newton's 2nd law: −mgsinα=mathena=−gsinα(and α=3.73