What is the unit of work done?

Joule

The correct answer is option 4. Joule.

The unit of work done is Joule.

The joule (symbol: J) is the SI unit of work and energy. It is defined as the amount of work done when a force of one newton is exerted over a distance of one meter in the direction of the force. Therefore, the joule is the standard unit used to measure work done.