physics
posted by Anonymous .
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?

physics 
Henry
h = 8steps * 0.4m/step = 3.2 m.
Ep = mg*h = 90kg*9.8N/kg * 3.2 = 2822.4 Joules.
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