The pinned nail.

There is a nail. It was pinned to the 5-centimeter-thick board. The nail is 10-centimeter long. So that, another part of the nail outside the board is 5-centimeter-thick (picture above).

If you want to take the nail out, you need to apply a force F=1000N in order to move the nail. Also , the force F will be decrease if lenght of the nail inside the board increase, too.

How much derived unit of energy do you need to take the nail out (calculate in Joule)

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