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Originally Posted by Flint
Can you (or anyone) please elaborate on the reasons why interpretation #1 is not “physically possible” ???
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Because the speed of the plane is not determined by its wheels. If you had a treadmill set up according to interpretation one, and the plane was being towed by a truck that was not on the treadmill, as soon as the truck started pulling, no matter how fast the treadmill went, the plane would be pulled forward, because the wheels would just move at the towing speed plus the treadmill speed. And then the magic treadmill would speed up to match that, and the wheels would speed up to match that, etc, etc, and it would rocket up to infinity.
The wheels are unpowered, so they will always spin at the speed of the treadmill (re ground) plus the speed of the plane (re ground). If you then set the speed of the treadmill to match the speed of the wheel rotation, you get a recursive equation. They can't both rely on each other.