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Question
If the P.E of a system decreases by 40 J, then the work done by external agent will be?
If the P.E of a system decreases by 40 J, then the work done by external agent will be?
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Solution
The correct option is B -40 J
If the Final Potential energy of a system is lesser than its initial potential energy, then the internal conservative force must have done some positive work. In turn it implies that the work done by external agent has to be negative.
If the Final Potential energy of a system is lesser than its initial potential energy, then the internal conservative force must have done some positive work. In turn it implies that the work done by external agent has to be negative.
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