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A wire of 4m in length suspended vertically stretches by 1mm when mass of 25Kg is attached to the lower end.What is the elastic potential energy gained by the wire?$g=10m/s^2$

$\begin{array}{1 1}(A)\;.10J\\(B)\;.12J\\(C)\;.25J\\(D)\;.20J\end{array} $

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