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A 65.0-kg runner has a speed of 5.20 m/s at one instant during a long-distance event. (a) What is the runner's kinetic energy at this

A 65.0-kg runner has a speed of 5.20 m/s at one instant during a long-distance event.
(a) What is the runner's kinetic energy at this instant?
(b) How much net work is required to double his speed.

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