The barricade at the end of a subway line has a large spring designed to compress 2.00 m when stopping a 2.05 x 10° kg train moving at 0.670 m/s. (a) What is the force constant of the spring? N/m (b) What speed would the train be going if it only compressed the spring 0.620 m? m/s (c) What force does the spring exert when compressed 0.620 m? (Enter the magnitude only.) N

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