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The stair stepper is a novel exercise machine that attempts to reproduce the work done against gravity by walking up stairs. with each step, brad (of mass 60 kg) simulates stepping up a vertical distance of 0.25 m with this machine. if brad exercises for 20 min per day with a stair stepper at a frequency of 60 steps per minute, what total work he does he do each day? the acceleration of gravity is 9.8 m/s 2 .
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