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A mass of 0.8 kg traveling at 4.09 m/s along a smooth, horizontal plane hits a...

A mass of 0.8 kg traveling at 4.09 m/s along a smooth, horizontal plane hits a relaxed spring. The mass is slowed to zero velocity when the spring has been compressed by 0.86 m. What is the spring constant of the spring, in N/m?

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