A nonzero external force acts on a system of particles. The velocity a

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 v0 and a0 at an instant t. It is possible that (a) vo = 0, a0 = 0 (b) v0 = 0, a0 ≠ 0, (c) v0 ≠ 0, a0 = 0 (d) v0 ≠0,a0≠ 0.
Answer» (b) v₀ = 0, a₀ ≠ 0, (d) v₀ ≠0,a₀≠ 0. Explanation: Since the external force is nonzero, there will be nonzero acceleration. Hence (b) and (d). It may be at rest at time t, then (b) otherwise (d).

A nonzero external force acts on a system of particles. The velocity and the acceleration of the centre of mass are found to be v0 and a0 at an instant t. It is possible that (a) vo = 0, a0 = 0 (b) v0 = 0, a0 ≠ 0, (c) v0 ≠ 0, a0 = 0 (d) v0 ≠0,a0≠ 0.

Answer»

(b) v₀ = 0, a₀ ≠ 0,

(d) v₀ ≠0,a₀≠ 0.

Explanation:

Since the external force is nonzero, there will be nonzero acceleration. Hence (b) and (d).

It may be at rest at time t, then (b) otherwise (d).