First slide

Motion of centre of mass

Question

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

Easy

A

Momentum of the system
B

Kinetic energy of the system
C

Velocity of centre of mass
D

Position of centre of mass

Solution

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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