A block attached to a spring pulled by a constant horizontal force is kept on a smooth horizontal surface as shown in figure. The maximum work done by applied force ‘F’, if initially spring is in its natural state

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F22k

F2k

2F2k

Zero

answer is C.

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Detailed Solution

W=ΔK⋅EF.x−12kx2=0x=2FkW=F.x=F×2FkW=2F2k

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