SAT Subject Physics Practice Question 26: Answer and Explanation

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Question: 26

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
E. –mghL

Correct Answer: 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.

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