The height h of the aerobic stepper shown is 25 cm. A 65 kg person goes up and down the st...

The height h of the aerobic stepper shown is 25 cm. A 65 kg person goes up and down the step once every 2 s. Accounting only for the work done in lifting her body and assuming that a muscle efficiency is 25%, determine the calories (1 C = 4.184 kJ) burned by the person in 1 h.

Figure P4.78