Assertion :A disk is rolling on the rough ground under the application of some external force is performing pure rolling, then friction force (if acting) acts as a conservative force. Reason: Kinetic friction force is sometimes nondissipative.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
When a body rolls without flipping, the friction acting is of static type. So the energy is conserved as static friction is non-dissipative.
Therefore, Assertion true, reason false.

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