Answer:
(a)
When a spring is compressed, work is done on the spring in compressing it.
Therefore, RE. increases.
(b) When a spring is stretched, work is done on the spring in
stretching it. Therefore, RE. increases.
(c) Two dissimilar charges attract each other and come closer.
Work is done by the field. Therefore, RE. 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, RE. decreases.
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