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A block attached to a spring, pulled by ...

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

A

`(F^(2))/(k)`

B

`(2F^(2))/(k)`

C

`(4F^(2))/(k)`

D

`(F^(2))/(2k)`

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The correct Answer is:
d
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