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

Options

A. 1.5V
B. 2V
C. V
D. Zero

Answer

D

Explanation

As the forces are internal,` F_("ext") = 0`,
So linear momentum of the system is conserved.
Hence, position is center of mass remain unchanged.