Question
Physics Question on System of Particles & Rotational Motion
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
Answer
zero
Explanation
Solution
As no external force is acting on the system, the centre of mass must be at rest i.e vCM=0.