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Catching a wave, a 77-kg surfer starts with a speed of 1.2 m/s , drops through...

Catching a wave, a 77-kg surfer starts with a speed of 1.2 m/s , drops through a height of 1.75 m , and ends with a speed of 8.3 m/s . How much nonconservative work was done on the surfer?

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