>> Tell me, does this mean that there's no such thing as an inelastic 
>> collission outside of textbooks?
> 
> YOu mean no such thing as an *elastic* collision?  No, not at a 
> macroscopic level.  Any collision is going to lose some energy to sound, 
> heat, plastic deformation etc, some things get pretty close though.

No, I mean... it's not "really" possible for two solid objects to hit 
each other without deforming at all.

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