JEE Main Physics question
Each Assertion–Reasoning question contains an Assertion (Statement 1) and a Reason (Statement 2). Choose: (A) Assertion is True, Reason is True; Reason is the correct explanation for Assertion (B) Assertion is True, Reason is True; Reason is NOT the correct explanation for Assertion (C) Assertion is True, Reason is False (D) Assertion is False, Reason is True
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.
Solution
A force applied exactly at the centre of mass of a rigid body produces zero torque about the centre of mass, yet it still produces a non-zero acceleration of the centre of mass (since regardless of where the
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