A 2-kilogram cart moving at 6 meters per second hits a stationary 2-kilogram cart. The two move off together at 3 meters per second. Lee contends, “Momentum is conserved in this collision because the momentum of the system has the same value before and after the collision.” Jackie counters, “The momentum of the system before the collision is 12 kilogram-meters per second, not zero, so momentum is not conserved.” With which student do you agree, and why?
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