Re: think about this...
The key here is that the belt isn't able to prevent the plane from having forward motion. A car moves forward by applying energy to the ground, a plane moves forward by applying energy to the air. The wheels will spin significantly faster, but otherwise it will have no affect on the speed of the plane.
The interesting question to me at this point is if the brakes on the wheels are applied, what happens. Also, if the plane isn't using any thrust to move forward but the belt is moving backward, do the wheels just spin or does the entire plane move?
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