each step of a ladder increases one's vertical height 40.0cm. If a 90 kg painter climbs 8 steps of the ladder, what is the increase in potential energy?

Answer 1

h = 8steps * 0.4m/step = 3.2 m.

Ep = mg*h = 90kg*9.8N/kg * 3.2 = 2822.4 Joules.