1.

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.

Answer»

Correct answer is 6 m/s

Taking the system as man and trolley and using conservation of linear momentum.

60 x v = (60 + 120) × 2 

⇒ v = 6 m/s



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