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How many sprints from rest to a speed of 5.7 m/s would a 56-kg woman have to complete to burn off 5.0 X 10^2 Calories? (Assume 100% efficiency in converting food energy to mechanical energy. Ignore the energy expenditure of slowing down.)
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Runner A is initially 5.9 km west of a flagpole and is running with a constant velocity of 8.3 km/h due east. Runner B is initially 4.8 km east of the flagpole and is running with a constant velocity of 7.6 km/h due west ...
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