A) On compressing a spring
B) On stretching a spring
C) On moving a body against gravitational force
D) On the rising of an air bubble in water
Correct Answer: D
Solution :
In compression or extension of a spring work is done against restoring force. In moving a body against gravity work is done against gravitational force of attraction. It means in all three cases potential energy of the system increases. But when the bubble rises in the direction of upthrust force then system works so the potential energy of the system decreases.
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