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Question

A block attached to a spring, pulled by a constant horizontal force, is kept on a smooth surface as shown in fig. Initially, the spring is in the natural length state. Then the maximum positive work that the applied force F can do is (given that string does not break)



A

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B

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C

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D

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Solution

The correct option is B


Applying work-energy theorem on the block, we get

Fl - 12kl2 = 0
l = 2Fk or work done = Fl = 2F2k

 


Physics

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