A heavy car A of mass 2000 kg travelling at 10 m/s has a head-on collision with a sports car B of mass 500 kg. If both cars stop dead on colliding, what was the velocity of car B?

Given

Mass of Car A, m1 = 2000 kg

Speed of Car A, v1 = 10 m/s

Mass of Car B, m2 = 500 kg

We need to find speed of Car B, v2

As per the law of Conservation of momentum

m1v1 = m2v2

On substituting, we get,

2000 x 10 = 500 x v2

v2 = (2000 x 10)/500

We get,

v2 = 40 m/s

Hence, the velocity of car B is 40 m/s

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