PhysicsFigure 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

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

  1. A

    1 m/s

  2. B

    1.5 m/s

  3. C

    2 m/s

  4. D

    0.5 m/s

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    Solution:

    50=250aAaA=0.2m/s250=500aBaB=0.1m/s2aAB=0.3m/s2VAB=aABt=1.5m/s

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