A truck is moving at constant velocity.Inside the storage compartment,a rock is dropped from the midpoint of the ceiling and strikes the floor below.The rock hits the floor
A)exactly below the midpoint of the ceiling.
B)ahead of the midpoint of the ceiling.
C)behind the midpoint of the ceiling.
D)More information is needed to solve this problem.
E)none of these

Question

Quizplus · Accepted Answer

Since the truck is moving at a constant velocity, we can assume there is no acceleration. Therefore, there is no force acting on the rock except for gravity. As a result, the rock will fall straight down from the midpoint of the ceiling and hit the floor directly below it. The horizontal velocity of the truck does not affect the vertical motion of the rock. Therefore, it hits the floor directly below the midpoint of the ceiling.

A Truck Is Moving at Constant Velocity