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A man weighing 60kg runs along the rails with a velocity of 18km/h and jumps into a car of mass 1 quintal standing on the rails. Calculate the velocity with which the car will start travelling along the rails.

A man weighing 60kg runs along the rails with a velocity of 18km/h and jumps into a car of mass 1 quintal standing on the rails. Calculate the velocity with which the car will start travelling along the rails. Correct Answer 1.88m/s

m1 = 60kg, u1 = 18km/h = 5m/s m2 = 1quintal = 100kg, u2 = 0, v = ? By conservation of linear momentum, (m1+m2)v = m1 u1+m2 u2 v = (60×5)/160 = 1.88m/s.

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