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PhysicsNEET 2019Elastic potential energy

Mechanical Properties of Solids

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

  1. A.MglMgl
  2. B.MgLMgL
  3. C.12Mgl\dfrac{1}{2}Mgl✓
  4. D.12MgL\dfrac{1}{2}MgL

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

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