A 28-meter uniform chain with a mass 2 kilograms per meter is dangling from the roof of a building. How much work is needed to pull the chain up onto the top of the building? Do this using a variable h, where first h is distance measured downward from the top of the chain (so h = 0 is the top of the chain and h = 28 is the bottom of the chain), then again where h is distance upward from the bottom of the chain.
