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Question

The potential energy of a certain spring when stretched through a distance ‘S’ is 10 joule. The amount of work (in joule) that must be done on this spring to stretch it through an additional distance ‘S’ will be

A
30
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B
40
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C
10
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D
20
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Solution

The correct option is A 30

12kS2 = 10 J (given in the problem)
12k [(2S)2(S)2] = 3×12kS2 = 3×10 = 30 J


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