Re: Physics graduate from Daryn\'s alma mater\'s answer
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To observers it would look like the plane was gliding along the treadmill. Wheels and treadmill both going the same speed in opposite directions.
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If the plane is gliding along the runway (i.e. moving with respect to the observer) then the wheels are not going the same speed as the runway. The distance the runway moves backward and the amount of track covered by the wheels are not equal for a given unit of time in this example and thus the speeds are not equal.
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