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

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

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Physics
A white and smooth surface is

Bad absorber and bad reflector of heat
Bad absorber and good reflector of heat
Good absorber and bad reflector of heat
Good absorber and good reflector of heat

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