PhysicsNEET 2019Elastic potential energy

Mechanical Properties of Solids

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:

A. $M g l$
B. $M g L$
C. $\frac{1}{2} M g l$ ✓
D. $\frac{1}{2} M g L$

You have the answer. The worked solution — and why the other three were written — is part of a paid pack.

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Last revised 7 Sept 2026. Found a mistake? Tell us — corrections are the fastest thing we act on.

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