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

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4 months ago

Using conservation of momentum:

60 * v = (60 + 120) * 2

⇒v = 6m/s

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