A 5 kg box is lifted vertically through 4 m. Taking g = 9.8 m/s², how much gravitational potential energy does it gain?
Correct answer D. 196 J
Explanation
ΔU = mgh = 5 × 9.8 × 4 = 196 J. Leaving out g gives just 20 J, while doubling the height by mistake gives 392 J.
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