Sounds like one of Zeno's paradox's regarding motion.
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Originally Posted by Wikipedia
Finally, in the arrow paradox, we imagine an arrow in flight. At every moment in time, the arrow is located at a specific position. If the moment is just a single instant, then the arrow does not have time to move and is at rest at that instant. Now, in following instants, it then must also be at rest for the same reason. The arrow is always at rest and cannot move: motion is impossible.
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