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A $5.00 \times 10^{5}\textrm{ kg}$ 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?
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Final Answer
$7.81\times 10^{5}\textrm{ N/m}$
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OpenStax College Physics Solution, Chapter 7, Problem 22 (Problems & Exercises) (3:32)

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