What type of energy is described as the energy of mass in motion?

Kinetic energy refers to the energy possessed by an object due to its motion. This type of energy is directly related to the mass of the object and its velocity. The formula for kinetic energy is given by ( KE = \frac{1}{2} mv^2 ), where ( m ) is mass and ( v ) is velocity. This relationship clearly illustrates that as either mass or velocity increases, kinetic energy also increases, meaning that the faster an object moves or the more massive it is, the more kinetic energy it has.

In contrast, potential energy is related to an object's position or configuration rather than its motion. Electrical energy deals with the movement of electrons through a conductor, while mechanical energy is a broader category that includes both kinetic energy and potential energy in a system. Kinetic energy specifically captures the essence of mass in motion, which is why it is the correct answer to this question.