Assertion :Work done by friction force in case of pure rolling,is equal to change in rotational energy. Reason: Ratio of kinetic energy of rotation to kinetic energy of translation is fixed for every case.

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 D Both Assertion and Reason are incorrect
The frictional force is non-dissipative in case of pure rolling
Therefore assertion is false.
Ratio of kinetic energy of rotation and translation depends on radiation of gyration.
Therefore reason is false.

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