Work, Power and Energy: Advanced — Work Theorem with PE MCQ

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Advanced — Work Theorem with PEHardQuestion 30479

Question

For a conservative system, W_conservative = −ΔU. If a particle moves from A to B in a gravitational field and W_gravity = 30 J, the change in gravitational PE is:

A
30 J
B
−30 J
Correct
C
60 J
D
0 J

Correct answer

−30 J

Explanation

W_gravity = −ΔPE → ΔPE = −W_gravity = −30 J. PE decreases by 30 J (particle moved to lower height).

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