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A 4 . 4 4 × 1 0 5 4.44×10 ​5 ​​ kg subway train is...

A 4 . 4 4 × 1 0 5 4.44×10 ​5 ​​ kg subway train is brought to a stop from a speed of 1.18 miles per hour in 0.465 m by a large spring bumper at the end of its track. What is the force constant k of the spring?

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