Definition of energy. (To easy)

energy:

-the strength and vitality required for sustained physical or mental activity.

-power derived from the utilization of physical or chemical resources, especially to provide light and heat or to work machines.

Explanation:

In physics, energy is the quantitative property that must be transferred to an object in order to perform work on, or to heat, the object. Energy is a conserved quantity; the law of conservation of energy states that energy can be converted in form, but not created or destroyed.

Explanation:

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