The base unit for energy in the SI system is?

The base unit for energy in the SI system is the joule, which is defined as one newton meter (Nm). Energy is a measure of the ability to do work, and in mechanical systems, work is done when a force causes a displacement. Therefore, when force (measured in newtons) is multiplied by distance (measured in meters), the result is energy, measured in joules.

In this context, newton meter not only signifies work but also serves as the foundational concept in various physical applications. Joules can also be expressed in other forms, but in terms of base SI units, the newton meter stands as the direct representation of energy. The other choices presented relate to either force, momentum, or power, none of which represent energy in the SI system.