What is the speed of the five-car train

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Three identical train cars, coupled together, are rolling east at 1.2 m/s . A fourth car traveling east at 4.2 m/s 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. What is the speed of the five-car train?

m/s

Reference no: EM13335573

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