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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 `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) 1 m/s (B) 2 m/s (C) 0.5 m/s (D) 1.5 m/s`

A

1 m/s

B

2 m/s

C

0.5 m/s

D

1.5 m/s

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