AP Physics 1 Question 213: Answer and Explanation

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Question: 213

3. A box of mass m slides down a frictionless inclined plane of length L and vertical height h. What is the change in its gravitational potential energy?

  • A. -mgL
  • B. -mgh
  • C. -mgL/h
  • D. -mgh/L

Correct Answer: B

Explanation:

B

Since the box (mass m) falls through a vertical distance of h, its gravitational potential energy decreases by mgh. The length of the ramp is irrelevant here. If friction were involved, then the length of the plane would matter.