Solved: Three identical train cars, coupled together, are rolling east at2.0 mis. A fo
Chapter 9, Problem 55(choose chapter or problem)
Three identical train cars, coupled together, are rolling east at2.0 mis. A fo utth car traveling east at 4 .0 mis catches up with thethree and couples to make a four-car train. A moment later, thetrain cars hit a fifth car that was at rest on the tracks, and it couplesto make a five-car train. What is the speed of the five-car train?
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