If the belt and was moving at the exact same speed as the plane, how was the plane able to move forward? If I run at 10 mph on a treadmil that is going 10mph, I don't move forward, I stay stationary... If I speed up my pace to 11 mph while the treadmil is still at the orig 10 mph, I move forward on the belt, if I slow my pace to 9 mph, I fall off the back...
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