6.5 A 10 000 kg train carriage (carriage A) is rolling along a level track in the positive ?-direction direction at a speed of 1.50 m s−1. It collides with a second 20 000 kg carriage (carriage B) which is stationary. The carriages do not stick together in the collision and after the collision carriage A is stationary . (a) What is the change in velocity of carriage A? (b) What is the change in momentum of carriage A? (c) What is the change in the total momentum of the system that includes both carriage A and B and nothing else?

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