# Answer on Mechanics | Relativity Question 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:

M

where M

2200*40 + 1800*200 = (2200 + 1800) V

V = 124000/ 4000 = 31 km/h.

Answer: 31 km/h

M

_{1}V_{1}+ M_{2}V_{2}= (M_{1}+ M_{2}) V,where M

_{1}, M_{2}are the masses of cars, V_{1}, V_{2}- the velocities.2200*40 + 1800*200 = (2200 + 1800) V

V = 124000/ 4000 = 31 km/h.

Answer: 31 km/h

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