Part 1: How many joules of energy does a 100 watts lightbulb use every hour?
How fast would a 77.0 kg person have to run to have that amount of kinetic energy?
Is it possible for a person to run that fast?
Part 2:
How high a tree would a 77.0 kg person have to climb to increase his gravitational potential energy relative to the ground by that amount?
Are there any trees that tall?