A block is launched up an inclined plane. After going up the plane, it slides back down to its starting position. The coefficient of friction between the block and the plane is 0.3. The time for the trip up the plane:
A) is the same as the time for the trip down.
B) is more than the time for the trip down.
C) is less than the time for the trip down.
D) cannot be found compared without knowing the angle of inclination.

Question

Quizplus · Accepted Answer

The time for the trip up is less than the time for the trip down because friction opposes the motion in both directions, but gravity assists the motion when coming down, making the descent slower.

A Block Is Launched Up an Inclined Plane