Physics
Conservation of energy refers to the fact that

Energy cannot be created or destroyed but can be converted from one form to another
The entropy of the universe is always increasing
If you conserve energy you will not be as tired
No chemical reaction is 100 percent efficient

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Physics
Kinetic energy depends on

The pressure of the moving body
The velocity or speed of the moving body.
Both mass and velocity of the moving body
The mass of the moving body

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