Question

An engine is used to pull a train of two cars out of a mine. The floor of the mine slopes upward at an angle of 30 degrees. Each car has a mass of 10^4 kg and travels without friction. The engine can exert a max force of 1.5 * 10^5 N on car A
a) The engine first accelerates the cars from rest by exerting its maximum force. What is the acceleration of the cars?
b) Once the train has reached a reasonable speed, the engineer throttles back so they continue at a constant speed. Now what force does the engine exert on car A?
c) What is the tension in the massless, straight chain connecting cars A and B while they are traveling at a constant speed?

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