Question

The SI unit of work or energy is the joule. Explain why the work and energy have the same SI unit?

Answer 1

Energy is what is lost or gained by doing work on an object or by the object. Therefore energy is required to produce work in an object.

In other words, energy is the form of work that is stored and work is the one that is used. Therefore, work and energy, while not synonyms, are consistent with respect to the object. So they both have the same SI unit.