Two particles A and B initially at rest move | vedclass

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(A) The system consists of two particles $A$ and $B$ moving under a mutual force of attraction. Since the mutual force is an internal force,there is n

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$Zero$

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(A) The system consists of two particles $A$ and $B$ moving under a mutual force of attraction. Since the mutual force is an internal force,there is no external force acting on the system $(F_{ext} = 0)$. According to the law of conservation of momentum,if the external force on a system is zero,the velocity of the centre of mass remains constant. Initially,both particles $A$ and $B$ are at rest,so the initial velocity of the centre of mass is $v_{cm} = 0$. Since the velocity of the centre of mass remains constant,it will continue to be $0$ at any instant,regardless of the individual speeds of the particles.

Two particles $A$ and $B$ initially at rest move towards each other under a mutual force of attraction. At the instant when the speed of $A$ is $v$ and the speed of $B$ is $2v$,the speed of the centre of mass of the system is:

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