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Three identical train cars, coupled together, are rolling east at speed vo. A fourth car...

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Three identical train cars, coupled together, are rolling east at speed vo. A fourth car traveling east at 200 catches up with the three and couples to make a four-car train. A moment later, the train cars hit a fifth car that was at rest on the tracks, and it couples to make a five-car train.? Part AWhat is the speed of the five-car train?Express your answer in terms of v0.

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