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Elastic Collision
Collisions among objects are governed through laws of momentum and energy. While a collision occurs in an isolated system, the whole momentum of the system of objects is conserved. Given that there are no net external forces acting upon the objects, the momentum of all objects before the collision equals the momentum of all objects after the collision. If there are just two objects included in the collision, then the momentum change of the individual objects are equal within opposite and magnitude within direction.
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