When the gravitational field does negative work, then P.E of body;
Correct answer: C. Must increase
- A. May increase
- B. May decrease
- C. Must increase
- D. Must decrease
Explanation
Negative work by gravity means gravity is acting opposite to displacement (lifting the body), so gravitational potential energy increases. Thus, P.E. must increase when gravity does negative work.
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About Work and Energy
Work transfers energy when a force causes displacement, while kinetic energy, gravitational potential energy and power describe motion, position and the rate of energy transfer. The work-energy theorem links net work with change in kinetic energy, and efficiency accounts for energy losses rather than treating them as energy destruction.
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