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A 72.9-kg boy is surfing and catches a wave which gives him an initial speed of 1.60 m/s. He then drops through a height of

A 72.9-kg boy is surfing and catches a wave which gives him an initial speed of 1.60 m/s. He then drops through a height of 1.61 m, and ends with a speed of 8.51 m/s. How much nonconservative work (in k]) was done on the boy? KJ

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