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Two particles A and B of equal mass are located at some distance from each other. Particle A is at rest while B moves away from A at speed v. What happens to the centre of mass of the system of two particles?

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it does not move

it moves with a speed v away from A

it moves with a speed v/2 toward A

it moves with a speed v/2 away from A

answer is D.

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Detailed Solution

As B is moving away from A, the velocity of centre of mass will be v/2 in the direction of motion of B.

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