Problem catching a wave a 77-kg surfer starts with a speed, Ask an Expert

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Problem: Catching a wave, a 77-kg surfer starts with a speed of 1.1m/s , drops through a height of 1.60m , and ends with a speed of 8.4m/s.

Part A: How much non conservative work was done on the surfer?

I need help to find how much non conservative work was done on the surfer.

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