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 speed of the block when it reaches the starting position on the trip down:
A) is the same as the launching speed.
B) is less than the launching speed.
C) is more than the launching speed.
D) cannot be compared to the launch speed with the information given.

Question

Quizplus · Accepted Answer

The block loses energy due to friction as it slides up and down the plane, so its speed when it returns to the starting position will be less than the launching speed.

A Block Is Launched Up an Inclined Plane