Q 1478080806.     A non-zero external force acts on a system of
particles. The velocity and the acceleration of the
centre of mass are found to be `v_0` and `a_0` at an instant
`t`. It is possible that

(This question may have multiple correct answers)

A `v_0=0,a_0=0`
B `v_0=0,a_0!=0`
C `v_0!=0,a_0=0`
D `v_0!=0,a_0!=0`

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