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Q.

A heavy weight is suspended from a spring. A person raises the weight till the spring becomes slack. The work done by him is W. The energy stored in the stretched spring was E. What will be the gain in gravitational potential energy?

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a

W

b

E

c

W+E

d

W-E

answer is C.

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Detailed Solution

Total gravitational energy gained is work done + energy released by the spring = W + E
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A heavy weight is suspended from a spring. A person raises the weight till the spring becomes slack. The work done by him is W. The energy stored in the stretched spring was E. What will be the gain in gravitational potential energy?