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A body of weight mg is hanging on a string that extends in length by l. The work done in extending the string is ___________

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A body of weight mg is hanging on a string that extends in length by l. The work done in extending the string is ___________

(a) mgl

(b) mgl/2

(c) 2mgl

(d) 0
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Correct choice is (b) mgl/2

The best explanation: W=Average force × extension

W=1/2 F×l=1/2 mg×l=mgl/2.
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