A 3×105-kg subway train is brought to a stop from a speed of 0.531 m/s in...
A 3×105-kg subway train is brought to a stop from a speed of 0.531 m/s in 0.522 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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A 3×105-kg subway train is brought to a stop from a speed of
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