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A freight train with a mass of 100,000 (kg) accelerates from 0 to 4 (m/s) in 20 (s). If the force of friction on the

A freight train with a mass of 100,000 (kg) accelerates from 0 to 4 (m/s) in 20 (s). If the force of friction on the train is 50,000 (N), what is the force from the engine pulling the train?

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