1.

A nonzero 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 :

Answer»

`v_0 = 0, a_0 = 0`
`v_0 = 0, a_0 != 0`
`v_0 != 0, a_0 = 0`
`v_0 != 0, a_0 != 0`

SOLUTION :As external FORCE is NON-zero so at this instant acceleration is non zero, but VELOCITY MAY or may not be zero


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