Perfectly Elastic Collision - Real World Examples

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A perfectly elastic collision is defined as a collision in which no kinetic energy is lost, meaning there is no sound or friction involved. This type of collision is primarily observed at the atomic level, such as in the interactions between gas particles. While perfectly elastic collisions are idealized concepts, they do not occur in the macroscopic world due to various energy losses. The discussion highlights the distinction between perfect and elastic collisions, emphasizing that perfect elasticity is a theoretical construct. Overall, perfectly elastic collisions are largely theoretical and not found in everyday experiences.
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What is a perfectly elastic collision?

Does it exist in the real world?
 
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Perfect elastic collision is a collision where no kinetic energy is lost during the collision (so there is no sound and no friction during the collision). This occurs on the atomic level (for example gas particles collide basically elastically)
 
i thought that's only an elastic collision?
 

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I do not have a good working knowledge of physics yet. I tried to piece this together but after researching this, I couldn’t figure out the correct laws of physics to combine to develop a formula to answer this question. Ex. 1 - A moving object impacts a static object at a constant velocity. Ex. 2 - A moving object impacts a static object at the same velocity but is accelerating at the moment of impact. Assuming the mass of the objects is the same and the velocity at the moment of impact...
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