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OpenStudy (anonymous):

Simple mechanics/forces question! A train consists of a caboose (mass = 1000 kg), a car (mass 2000 kg), and an engine car (mass 2000 kg). If the train has an acceleration of 5 m/s2, then the tension force in the coupling between the middle car and the engine car is: A) 25,000N B) 20,000N C) 15,000N D) 10,000N I know the answer is 15,000N, but would someone mind explaining why/how? Thanks! (Picture is at http://cwx.prenhall.com/giancoli/chapter4/medialib/f4-7.gif )

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