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Figure shows a boy on a horizontal platf...

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 `250kg` and that' of box B is `500kg.` The velocity of A relative to the box B 5 s after the boy on A begins to pull ,the rope,will be:

A

`1m//s`

B

`1.5 m//s`

C

`2m//s`

D

`0.5m//s`

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The correct Answer is:
B
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