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@mngrif you arent entierly wrong. but relative means something very special that might help you understand here. If your in a spaceship in an empty universe with nothing to measure againstoutside of your ship, how would you know if you have velocity? You cant feel it or measure it in anyway.. acceleration you can and will, you will literally feel it.
@freemo @mngrif Acceleration is relative if you allow for non-inertial reference frames. The absolute calculus was invented to address this very issue and was a necessary element of the theory of general relativity. As to your example, a spaceship traveling at constant velocity is an inertial reference frame, and the definition of such things is that the acceleration is not relative to the reference frame. As to what you feel, I would ask do you feel gravity pulling you down the way you feel other accelerations? I think we perceive things in a non inertial reference frame.
