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Give the expressions for work done by th...

Give the expressions for work done by the spring and external pulling force.

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Work done by the spring force `=W_(s)=-int_(0)^(x_(m))F_(s)dx`
i.e. `W_(B)=-int_(0)^(x_(m))kxdx`
`W_(B)=-(1)/(2)kx_(m)^(2)`
Work done by the external pulling force =`W=(1)/(2)kx_(m)^(2)`
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