A subway train has three cars each weighing 120 x 105 n the, Physics

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A subway train has three cars each weighing 120 x 105 n the

A subway train has three cars, each weighing 1.20 x 105 N. The frictional force on each car is 103 N, and the first car, acting as an engine, exerts a horizontal force of 4.80 x 104 N on the rails.

(a) What is the acceleration of the train?

(b) What is the tension in the coupling between the first and second cars?

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Physics: A subway train has three cars each weighing 120 x 105 n the

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