Assertion :If there is no external torque on a body about its centre of mass, then the velocity of the centre of mass remains constant Reason: The linear momentum of an isolated system remains constant.

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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Assertion is incorrect and Reason is correct

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Solution

The correct option is D Assertion is incorrect and Reason is correct
No external torque on a body about it's center of mass means conservation of angular momentum about the C.O.M. But velocity will change if there is force present on the body which will change $V_{C O M}$ .

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