From one book, I read that if we release a ball horizontally on earth, its velocity does change in very accurate observations. If we track its motion, we get full information of its motion (incl. acceleration respect to an true inertial frame).
And we can then compare it to the ideal linear uniform motion, then we get our acceleration to an true inertial frame (in which newtons 1st law is true), right? So with the developed formulas, we get all things we ever wanted in an exactly true inertial frame, can't we?
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