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Q.

A man of 60 kg is running on the road and suddenly jumps into a stationary trolly car of mass 120 kg. Then, the trolly car starts moving with velocity 2 ms-1. The velocity of the running man was__________ms-1, when he jumps into the car.

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answer is 6.

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Detailed Solution

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Taking the system as man and trolley and using 
conservation of linear momentum. 
60 × v = (60 + 120) × 2 
⇒v = 6 m/s

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