A kinesiology student competed in the Du Bois Library Tower Run while measuring his oxygen consumption by wearing a portable respirometer. The student had a mass of 73 kg and the Du Bois library has 440 steps with a vertical rise of 17.9 cm per step. It took him 140 s to complete the tower run. Based on this information, determine how much mechanical work the student did. From his oxygen consumption it was estimated that he expended metabolic energy at a rate of 22.3 kcal/min while running up the stairs. Based on this information, determine his percent movement efficiency (Hint: 1 J = 0.000239 Kcals).