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in Motion of System of Particles and Rigid Bodies by (48.5k points)
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A child sits stationary at one end of a long trolley moving uniformly with speed V on a smooth horizontal floor. If the child gets up and runs about on the trolley in any manner, then what is the effect of the speed of the centre of mass of the (trolley + child) system ?

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No change in speed of system as no external force is working.

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