Two particles initially at rest attract each other by internal forces. At an instant their speeds are v and 2v. What is the speed of their centre of mass?

Physics · Center of maas , Momentum and Collision · velocity and acceleration of center of mass,newton second law for system

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Two particles initially at rest attract each other by internal forces. At an instant their speeds are v and 2v. What is the speed of their centre of mass?

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