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@villa-ru
This thread reminds me of the epic Singletrackworld 'Plane on a conveyer belt' thread from back in the day. Many, many lols were had. Seems to have disappeared up the internet now.
Here's the question (no googling now kids):
On a day with absolutely calm wind, a plane is standing on a runway that can move (some sort of band conveyor). The plane moves in one direction, while the conveyor moves in the opposite direction. The conveyor has a control system that tracks the plane speed and tunes the speed of the conveyor to be exactly the same (but in the opposite direction). Can the airplane ever take off?