Answer:
Energy can not be created nor destroyed.
Explanation:
Conservation of energy refers to the statement that energy can't be created nor destroyed, it can only be transformed into another form of energy. For example, if a pendulum swing to and fro motion, the kinetic energy is converted into potential energy. A closed system can exchange energy with its surroundings and transform that energy into heat and work. Total energy of an isolated system remains constant because no energy go out from the system.
