Each time he does one pushup, Jose, who has a mass of 75 kg, raises his center of mass by 25 cm. He completes an impressive 150 pushups in 5 minutes, exercising at a steady rate.

a. If we assume that lowering his body has no energetic cost, what is his metabolic power during this workout?

b. In fact, it costs Jose a certain amount of energy to lower his body—about half of what it costs to raise it. If you include this in your calculation, what is his metabolic power?