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In most cases 30 fps works just fine. (anything slower getsto be very noticeable) When extreme speed is involved (like in racing) is where you will noticed the big differences between 30fps to 60fps.

 As far as the fps the eye can see isn't so clearly seen the brain converts an antalog signal to digital and create it's own snapshot frames. Thus there is a difference between what you eyes sees and what your brain sees.