A system of particles is free from any external force. If v→ and a→ be the velocity and acceleration of the centre of mass, then it necessarily follows that:

Absence of external force, only confirms about the fact that a → = 0 . However, v → may or may not be zero.

v → not equal to zero; a → = 0

v → = 0 ; a → is not equal to zero

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A system of particles is free from any external force. If $\vec{v}$ and $\vec{a}$ be the velocity and acceleration of the centre of mass, then it necessarily follows that:

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$\vec{v} = 0$ ; $\vec{a}$ = 0

$\vec{v}$ not equal to zero; $\vec{a}$ = 0

$\vec{v} = 0$ ; $\vec{a}$ is not equal to zero

None of these

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Absence of external force, only confirms about the fact that $\vec{a} = 0$ . However, $\vec{v}$ may or may not be zero.

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