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A man weighing 80 kg is standing on a tr...

A man weighing `80 kg` is standing on a trolley weighting `320 kg`. The trolley is resting on frictionless horizontal rails. If the man starts walking on the trolley along the rails at speed `1 m//s` (w.r.t. to trolley) then after `4 s` his displacement relative to the ground will be :

A

5 m

B

4.8 m

C

3.2 m

D

`3.0`

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