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A body of mass m moves with speed 2v and a body of mass 2m moves with speed v on a smooth horizontal surface, both along positive x axis. After some time, they collide and stick together. What is the speed of the system after they stick together?

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A body of mass m moves with speed 2v and a body of mass 2m moves with speed v on a smooth horizontal surface, both along positive x axis. After some time, they collide and stick together. What is the speed of the system after they stick together?



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