7. [Walker2 8.P.026.] Catching a wave, a 75 kg surfer starts with a speed of 1.3 m/s, drops through a height of 2.05 m, and ends with a speed of 8.2 m/s. How much nonconservative work was done on the surfer? I used delta K + delta U is nonconservative force. They want kJ instead of J. :yuck: I got -0.951375 kJ but it tells me I'm wrong. I only have one more try. Could it be this number but positive?