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Question

A spring 40mm long is stretched by applying a force. If 10N force is required to stretch the spring through one mm, then work done in stretching the spring through 40mm is

A
24J
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B
8J
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C
56J
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D
54J
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Solution

The correct option is B 8J
F=k×x
10=k×0.001
k=10000N/m

Energy=12kx2
Energy=12×10000×(0.04)2
Energy=8J

Hence correct answer is option B


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