JEE Main Physics question

Physics Systems of Particles and Rotational Motion JEE Main

**Statement 1:** If there is no external torque on a body about its centre of mass, then the velocity of the centre of mass remains constant.

**Statement 2:** The linear momentum of an isolated system remains constant.

(A)Assertion is True, Reason is True; Reason is correct explanation for Assertion
(B)Assertion is True, Reason is True; Reason is not correct explanation for Assertion
(C)Assertion is True, Reason is False
(D)Assertion is False, Reason is TrueCorrect

Answer: (D)

Solution

Zero net torque about the centre of mass constrains only the rate of change of angular momentum (so may remain constant), not the linear velocity of the centre of mass —

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Question ID VK-159149