11. How much work would you have to do to carry that weight back up to the original height?

The amount of work required to lift the weight back to its original height is equal to the amount of work done by gravity as it fell. This is because work is a transfer of energy, and the potential energy lost by the object as it falls is equal to the work done by gravity. To lift it back up, you must put that same amount of energy back into the system, thus doing the same amount of work.<br />