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A 73.8-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

A 73.8-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 1.56 m, and ends with a speed of 8.51 m/s. How much nonconservative work (in kJ) was done on the boy? 2543

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