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Figure shows a boy on a horizontal platform A on a smooth horizontal surface, holding a rope attached to a box B. Boy pulls the rope with a constant force of 50 N. The combined mass of platform A and boy is 250 kg and that of box B is 500 kg. The velocity of A relative to the box B 5 s after the boy on A begins to pull the rope, will be :
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Correct option is B
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The velocity of the CM of a system changes from to during time = 2s. If the mass of the system is m: l0 kg, the constant force acting on the system is:
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