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A system of particles is acted upon by a constant nonzero external force. If `v` and `a` are instantaneous velocity and acceleration of the centre of mass, then it is possible that at a given instant

A

`v=0`, `a=0`

B

`v ne 0`, `a=0`

C

`v=0`, `a ne 0`

D

`v ne 0`, `a ne 0`

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