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A competitor in the world knee slide championships slides across a horizontal floor (which we hope has no splinters) a distance of 7.99 m before

A competitor in the world knee slide championships slides across a horizontal floor (which we hope has no splinters) a distance of 7.99 m before coming to rest. If the coefficient of kinetic friction between the competitor's knees and the floor is 0.353, how fast was the competitor travelling when they first started to slide?

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