7.4 Exercise 24

When jogging at 13 km/h on a level surface, a 70-kg man uses energy at a rate of approximately 850 W. Using the facts that the “human engine” is approximately 25% efficient, determine the rate at which this man uses energy when jogging up a $5.0 °$ slope at this same speed. Assume that the frictional retarding force is the same in both cases.