Physics

A train has a mass of 5.22 X 10^6 kg and is moving at a speed of 90 km/h. The engineer applies the brakes, resulting in a net backward force of 1.87 X 12^6 N on the train. The brakes are held on for 30.0 s (a) What is the final speed of the train? (b) How far does the train travel during this period?

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