AP Physics B Practice Exam

Category - Introductory Physics

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Three different boxes are lifted to different heights.

Box X weighs 115 N and is lifted to 15 m.
Box Y weighs 210 N and is lifted to 10 m.
Box Z weighs 305 N and is lifted to 5 m.

Which of the following statements best describes the boxes’ change in mechanical energy?

Box X had the greatest change in mechanical energy.
Box Z had the smallest change in mechanical energy.
Boxes X and Y had the same change in mechanical energy.
Boxes Y and Z had the same change in mechanical energy.

Explanation

Answer: B - Box Z had the smallest change in mechanical energy.

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