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Answer to Question #3708 in Mechanics | Relativity for marisa

Question #3708
2200 kg car moving at 40 km/h collides head on with an 1800 kg car moving at 20 km/h. find the velocity of the combined cars after the collision.
Expert's answer
Using the moment conservation law, we write the following equation:
M1V1 + M2V2 = (M1 + M2) V,
where M1, M2 are the masses of cars, V1, V2 - the velocities.
2200*40 + 1800*200 = (2200 + 1800) V
V = 124000/ 4000 = 31 km/h.

Answer: 31 km/h

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