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#9 A 2000 kg train engine traveling east at 2 m/s couples with a 1200 kg train car also traveling east, and they move together

#9 A 2000 kg train engine traveling east at 2 m/s couples with a 1200 kg train car also traveling east, and they move together with a speed of 3 m/s towards the east. What was the speed of the train car before the coupling

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