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 mutual internal forces of attraction.Since there are no external forces acting on th

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(A) The system consists of two particles $A$ and $B$ moving under mutual internal forces of attraction.Since there are no external forces acting on the system,the net external force $F_{ext} = 0$.According to the law of conservation of momentum,the velocity of the center of mass $v_{cm}$ remains constant.Initially,both particles are at rest,so the initial velocity of the center of mass $v_{cm, initial} = 0$.Therefore,the velocity of the center of mass at any subsequent instant must remain $0$.

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 center of mass of the system is:

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