Assertion (A): If there is no external torque | vedclass

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(C) The Assertion $(A)$ is false. The absence of external torque about the centre of mass implies that the angular momentum of the body remains consta

Vedclass · Accepted Answer

If Assertion is true but Reason is false.

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(C) The Assertion $(A)$ is false. The absence of external torque about the centre of mass implies that the angular momentum of the body remains constant,not the velocity of the centre of mass. The velocity of the centre of mass remains constant only if the net external force acting on the body is zero.The Reason $(R)$ is true. According to the law of conservation of linear momentum,the linear momentum of an isolated system (where the net external force is zero) remains constant.Since the Assertion is false and the Reason is true,the correct option is $(C)$.

Assertion $(A):$ 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 $(R):$ The linear momentum of an isolated system remains constant.

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Assertion $(A):$ 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 $(R):$ The linear momentum of an isolated system remains constant.