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

Question

A system of particles is free from any external force. If vecv and veca be the velocity and acceleration of the centre of mass, then it necessarily follows that: (A)  vecv=0 ; veca=0 (B)  vecv ≠ 0 ; veca=0 (C)  vecv=0 ; veca ≠ 0 (D) None of these

Tardigrade Admin · Accepted Answer

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

Q. 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:

$v = 0; a = 0$

$v \neq = 0; a = 0$

$v = 0; a \neq = 0$

None of these

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

Q. 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:

v=0;a=0

v=0;a=0

v=0;a=0