A jogger with mass m = 55 kg uses energy at a rate of P = 645 W when she jogs on horizontal ground at a constant speed of s = 4.4 m/s. The efficiency of her "human engine" however, is e = 0.25. (In other words, the power used for locomotion is e = 0.25 times the total power.)

part. A What expression for the rate of energy expenditure when she jogs at the same constant speed up a slope of = 4.39 degrees. Assume whatever frictional or drag forces are the same in each case. Your answer should be in terms of the symbols given in the problem statement and g (9.80 m/s²).

part. b What is the rate of energy expenditure when she jogs up the slope, in watts?