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A 100 ? / ? constant spring horizontal spring compresses 20 ?? and is used to...

A 100 ? / ? constant spring horizontal spring compresses 20 ?? and is used to launch a 2.5 ?? box across a horizontal surface without friction. After the box travels a certain distance, the surface becomes rough. The coefficient of kinetic friction of the box on the surface is 0.15. Determine how far the box slides on the rough surface before stopping.

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