Hi! Inthis comment I explain the energy concept:

Energy is the capacity who is possessing a person or an object for realice a work. There are two important forms of energy in the world:

• Kinetic energy.
• Potential energy.

Energy cannot be made or destroyed, it is changed from one form to another. The amount of energy in a closed system is always the same. This rule is called the "conservation law of energy".

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Anna's, Hossni and Ernest