Question

 Michael (mass of approximately 60 kg) does push-ups by applying a force to elevate its center-of-mass by 20 cm in order to do 850 Joule of work. If the man does all this work in 5 seconds, then determine its power.

Answer 1

The power is given by

$$P=\frac{W}{t}=\rm \frac{850\: J}{5\: s}=170\: W$$