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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

`oo`

D

`(F^(2))/(2K)`

Text Solution

Verified by Experts

The correct Answer is:
B
Applying work energy theorema on block

`Fl-1/2kl^(2)=0 :. L=(2F)/k` or
Work done `=Fl=(2F^(2))/k`
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