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Explain with reason whether the potentia...

Explain with reason whether the potential energy in the following cases increases or decreases:
(a) a spring is compressed,
(b) a spring is stretched,
(c) two dissimilar charges brought near each other,
(d) a body is taken away agains the gravitational force.

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(a) When a spring is compressed, work is done on the spring in compressing it. Therefore, P.E. increases.
(b) When a spring is stretched. Work is done on the spring in stretching it. Therefore, P.E. increases.
(c ) Tow dissimilar charges attract each other and come closer. Work is done by the field. Therefore, P.E. decreases.
(d) Work is done by us in taking the body away against the gravitational force. Therefore, P.E. increases.
(e) Air bubble rises up in water because of upthrust. Therefore, P.E. decreases.
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