Two atoms of a gas bumping into each other is a perfectly elastic collision most of the time, unless the velocity is high enough to excite an electron to a higher energy level.
Collisions of large objects are never perfectly elastic, but some, such as billiard balls, are very close to perfect.
A collision of two cars is inelastic.
One does not use the terms "perfect" or "imperfect" for inelastic collisions. They are what they are.
can anyone give an example of imperfect inelastic collision and how is it different from perfect inelastic. My teacher and the book didn't mention anything about imperfect one
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