John (m=78 kg) increases velocity from zero to 5 m/s in 3 seconds. His O2 consumption during

sprinting is 85 ml/s and his O2 consumption at rest is 8 ml/s. Calculate (a) the mechanical work done by

the sprinter, (b) the mechanical power of the sprinter, (c) gross efficiency, and (d) net efficiency. Assume

1 ml of O2 produces 20.1 Joules of energy.