Which of the following is not a form of energy mentioned?

Momentum is not classified as a form of energy; rather, it is a vector quantity that describes the motion of an object based on its mass and velocity. Energy, in contrast, can take various forms, such as mechanical energy, which is the sum of kinetic and potential energy in a system; thermal energy, which relates to the temperature of a substance and the motion of its particles; and gravitational energy, which is related to an object's height above a reference point and the force of gravity acting on it. While momentum involves aspects of mass and velocity, it does not constitute energy in the same way the others do.