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  4. When a block of mass M is suspended by a long wire of length L. the length of the wire becomes (L+ l). The elastic potential energy stored in the extended wire is:

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Q. When a block of mass $M$ is suspended by a long wire of length $L$. the length of the wire becomes $(L+ l)$. The elastic potential energy stored in the extended wire is:

NEETNEET 2019Mechanical Properties of Solids

Solution:

$U = \frac{1}{2} $ (work done by gravity)
$U = \frac{1}{2} Mgl$

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