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If the net external force acting on the system of particles is zero, then the quantity which may vary is

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Momentum of the system

Kinetic energy of the system

Velocity of centre of mass

Position of centre of mass

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detailed solution

Correct option is B

When external force acting on a system of particles is zero then velocity of the center of mass remains constant and the position of the center of mass remains stationary. But internal force can do the work hence kinetic energy may change.

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