Q.

If the net external forces acting on the system of particles is zero, then which of the following may vary?

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a

Momentum of the system

b

Velocity of centre of mass

c

Position of centre of mass

d

None of the above

answer is C.

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Detailed Solution

The centre of mass under the given condition may be at rest or may be moving with constant velocity, i.e. position of CM may be at rest or moving with constant velocity.
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