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A 0.48-kg metal sphere oscillates at the end of a vertical spring. As the spring stretches...

A 0.48-kg metal sphere oscillates at the end of a vertical spring. As the spring stretches from 0.12 m to 0.23 m (relative to its unstrained length), the speed of the sphere decreases from 6.0 to 4.2 m/s. What is the spring constant of the spring?

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