A roller coaster has a mass of 300 kg. It drops from rest at the top of a hill
that's 101 m tall. How fast is it going when it reaches the bottom?
Acceleration due to gravity is g = 9.8 m/s2.

A. 44.5m/s
B. 41.2 m/s
C. 76.7 m/s
D. 21.8 m/s

The answer is 44.5 m/s

44.5 m/s

Explanation:

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.