Answer to Question #3708 in Mechanics | Relativity for marisa
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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