Two particles which are initially at rest, move towards each other under the action of their internal attraction. If their speeds are v and 2v at any instant, then the speed of centre of mass of the system will be

Question

Two particles which are initially at rest, move towards each other under the action of their internal attraction. If their speeds are v and 2v at any instant, then the speed of centre of mass of the system will be (A) 2v (B) zero (C) 1.5v (D) v

Tardigrade Admin · Accepted Answer

As no external force is acting on the system, the centre of mass must be at rest i.e vCM=0.

Q. Two particles which are initially at rest, move towards each other under the action of their internal attraction. If their speeds are $v$ and $2 v$ at any instant, then the speed of centre of mass of the system will be

2v

zero

1.5v

v

As no external force is acting on the system, the centre of mass must be at rest i.e $v_{CM} = 0.$

Q. Two particles which are initially at rest, move towards each other under the action of their internal attraction. If their speeds are v and 2v at any instant, then the speed of centre of mass of the system will be

2v

zero

1.5v

v

As no external force is acting on the system, the centre of mass must be at rest i.e vCM​=0.

Q. Two particles which are initially at rest, move towards each other under the action of their internal attraction. If their speeds are $v$ and $2 v$ at any instant, then the speed of centre of mass of the system will be

As no external force is acting on the system, the centre of mass must be at rest i.e $v_{CM} = 0.$