A man weighing 80 kg is standing in a trolley weighing 320 kg. The trolley is resting on frictionless horizontal rails. If the man starts walking on the trolley with a speed of 1 m / s, then after 4 sec his displacement relative to the ground will be
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If the man starts walking on the trolley in the forward direction then whole system will move in backward direction with same momentum.
Momentum of man in forward direction = Momentum of system (man + trolley) in backward direction
⇒ ⇒ 
⇒ ⇒ 
So the velocity of man w.r.t. ground 
Displacement of man w.r.t. ground 
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