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Question

The car A of mass 1500kg travelling at 40m/s collides with another car B of mass 1250kg travelling at 25m/s in the same direction. After collision the velocity of car A becomes 30m/s. calculate the velocity of car B after the collision.

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Solution

BY LAW OF CONSERVATION OF MOMENTUM WE HAVE

1500 * 40 + 1250* 25 = 30 * 1500 + 1250* Vb
60000 + 31250 = 45000 + 1250*Vb
91250 - 45000 = 1250Vb
46250 = 1250Vb
therefore Vb = 46250 / 1250
= 37 m/sec

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