A child is standing at one end of a long trolley moving with a speed v on a smooth horizontal floor. If the child starts running towards the other end of the trolley with a speed u, the centre of mass of the system (trolley + child) will move with a speed
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D
The speed of the centre of mass of the system remains unchanged (equal to v) because no external forces acts on the system. The force involved in running on the trolley are internal to this system.
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