First slide

Centre of mass(com)

Question

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

Easy

A

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

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

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

both 2 and 3

Solution

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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