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Section (b) Ke - Wn : 1441.92 - 480.639 but keep getting wrong answer what I'm doing wrong here please help. A 63.6 kg runner

Section (b) Ke - Wn : 1441.92 - 480.639 but keep getting wrong answer what I'm doing wrong here please help.

A 63.6 kg runner has a speed of 3.90 m/s at one instant during a long-distance event. HINT (a) What is the runner's kinetic energy at this instant (in J)? 480.64 (b) How much net work (in ]) is required to triple his speed? 961.281 X J

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