Assertion (A): If there is no external torque on a body about its centre of mass, then the velocity of the center of mass remains constant.
Reason (R): The angular momentum of a system always remains constant.
Solution:
Assertion (A) is false; constant COM velocity requires zero net external force, not zero external torque.
Reason (R) is false; angular momentum is conserved only when net external torque is zero.
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