Question

A man with a mass of 67.0 kg runs up four flights of stairs in 15.0 secs. The

man has gone a vertical distance of 90 cm. Determine the amount of work

done by the man to elevate his body to this height. Assume that his speed

is constant. 

Answer 1

$$W=mgh,$$ $$W=67\ kg\cdot9.8\ \dfrac{m}{s^2}\cdot0.9\ m=591\ J.$$