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A 3.00 10 5 kg subway train is brought to a stop from a speed of 0.500 m/s in 0.400 m by a large spring

A 3.00 10⁵ kg subway train is brought to a stop from a speed of 0.500 m/s in 0.400 m by a large spring bumper at the end of its track. What is the force constant k of the spring (in N/m)?

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