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We will learn The Equivalence Principle in 3 examples:
1) The observers can not tell the difference of playing volleyball on Earth or in a spaceship where accelerating=gravity.
2) A super-ball will behave the same way whether on Earth or in a spaceship where accelerating=gravity.
3) Light will “bounce” back and forth downwards between 2 perfect vertical mirrors in a spaceship where accelerating=gravity.

Next video in this series can be seen at:
https://youtu.be/CxgHlr9OTvs