When an object that weighs 48 newtons is raised 2 meters anywhere on or near the Earth's surface, its gravitational potential energy increases by (48 • 2)= 96 joules. Using the law of Conservation of Energy, we know that it must take at least 96 joules of work, then, to raise the object.
I can't see this scenario involving a 48-newton man and a ladder, though. The poor guy only weighs about 10.8 pounds, he probably can't even walk yet, and he has no business around ladders.
