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A train consists of 90 Mg engine and four cars each having a mass of 55...

A train consists of 90 Mg engine and four cars each having a mass of 55 Mg. If it takes 70 s for the train to increase velocity to 60 km/h starting from 20 km/h. a. Determine force T developed at the coupling between car B and C. (5 pts) b. Determine the traction force F for the engine

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