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http://en.wikipedia.org/wiki/Equivalence_principle
I've been trying to understand this. Particularly the following bit:
 Originally Posted by Einstein
Whenever an observer detects the local presence of a force that acts on all objects in direct proportion to the inertial mass of each object, that observer is in an accelerated frame of reference.
Suppose that the earth is the only massive object in the universe. It doesn't orbit anything and it doesn't rotate. Under these conditions, if i picked up an apple and released it, apply no forces to it, would it remain motionless in mid air?
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