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) 1.5 (d) v

Answer 1

Answer:

b is the answer of this question

Answer 2

Answer:

b) zero

Explanation:

net external force= 0

hence there will be no change in position of centre of mass with respect to body.

conclusion:

speed of centre of mass=0