A 5 x 105 kg subway train is brought to a stop from a speed of 0.420 m/s in 0.380 m by a large spring bumper at the end of its track. Neglect friction. - List all external forces act on the train during its slowing by the spring, indicating if the forces are conservative or non-conservative. Which forces do work during the stopping of the train? -Is the mechanical energy of the train and the spring system conserved  during the stopping of the train? Why? - Calculate the force constant k of the spring? Write the formula you used.

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