Momentum is usually not exactly conserved in a real world demonstration of momentum conservation. What is a possible reason for this fact?

For any collision occurring in an isolated system, momentum is conserved. The total amount of momentum of the collection of objects in the system is the same before the collision as after the collision.

Explanation:

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waves moving from a fast medium to a slow medium will experience a reflection as light travels more slowly than red light. total internal reflection occurs when the critical angle is.

measuring things 1 litre of water