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Question

A system of particles is free from any external force. If v and a be the velocity and acceleration of the centre of mass, then it necessarily follows that

A
v=0;a=0
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B
v0;a=0
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C
v=0;a0
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D
Both (a) and (b)
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Solution

The correct option is D Both (a) and (b)
Absence of external force, only confirm about the fact that a=0. However, v may or may not be zero

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