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A comment on The theory of relativity in words of four letters or less. Parent comment
You can't. There is absolutely no test that can tell you this.
You can't "drop" anything - whatever force is accelerating you also accelerates the object, so letting go of it tells you nothing.
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You can't. There is absolutely no test that can tell you this.
You can't "drop" anything - whatever force is accelerating you also accelerates the object, so letting go of it tells you nothing.