IIT-JEE 2007 · Paper 2 · Physics Q10

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PhysicsAssertion and reason+3 / -1Question 10 of 66

STATEMENT-1: If there is no external torque on a body about its center of mass, then the velocity of the center of mass remains constant.

because

STATEMENT-2: The linear momentum of an isolated system remains constant.

Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1

Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1

Statement-1 is True, Statement-2 is False

Statement-1 is False, Statement-2 is True

Answer and worked solution

Official answer: D

Statement 1. Zero torque about the centre of mass says nothing about the net force; an external force through the centre of mass accelerates it. False.

Statement 2. With no external force, momentum is conserved. True.

(D)

Topics:Centre of mass Conservation of linear momentum

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IIT-JEE 2007 · Paper 2, Physics question 10