Assertion (A) : The elastic potential energy of a spring increases when it is elongated and decreases when it is compressed.
Reason (R) : Work done on spring is stored in it as elastic potential energy.

Both assertion and reason are true and the reason is correct explanation of the assertion

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Both assertion and reason are true, but reason is not correct explanation of the assertion

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Assertion is true, but the reason is false

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Assertion is false, but the reason is true

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Solution

The correct option is D Assertion is false, but the reason is true
Elastic potential energy increases whether it is compressed or elongated. Because in both cases work done by external force is opposed by spring.
Work is done against spring. Therefore, it's PE is increased.

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Similar questions

Assertion (A): Steel is more elastic than rubber.

Reason (R) : Under a given deforming force, steel is deformed less than rubber.

Reason : Work function $h f_{0}$ where $f_{0}$ is the threshold frequency.

SHM

\frac{1}{4} m ω^{2} A^{2}

\frac{1}{2} m ω^{2} A^{2}

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