Physics
The recoiling of gun is an example of which of the following?

Law of Conservation of Angular Momentum
Law of Conservation of Linear Momentum
Conversion of Kinetic Energy to Potential Energy
Law of Conservation of Energy

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Physics
Conservation of energy refers to the fact that

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

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