Question

A person of mass 64 kg climbs up a ladder to a height of 5.0 meters.

What work does the person do?

What is the increase in gravitational potential energy of the person at this height?

Where does the energy come from to cause this increase in P.E?

Answer 1

$$W=mgh=(64)(9.8)(5)=3100 J=3.1 kJ.$$

$$\Delta E_p = W=3.1 kJ.$$

It is the energy of the person.