A nonzero external force on a system of ...

A nonzero external force on a system of particles. The velocity and the acceleration of the cente of mass are found to be `v_0 and a_0` at an instant t. It is possible that

`v_0=0,a_0=0`

`v_0=0,a_0ne0`

`v_0ne0,a_0=0`

`v_0ne0,a_0=1`

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