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Momentum conservation

In a collision, the effect of external forces such as gravity or friction is not taken into account as due to small duration of collision (Δt) average impulsive force responsible for collision is much larger than external force acting on the system and since this impulsive force is “internal,” therefore the total momentum of system always remains conserved.

Energy conservation

In a collision, “total energy” is also always conserved. Here total energy includes all forms of energy such as mechanical energy, internal energy, excitation energy, radiant energy, or even mass energy.
These laws are the fundamental laws of physics and applicable for any type of collision but this is not true for conservation of kinetic energy.

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