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Okay heres another scenario.
You are on a 50 foot long treadmill.
You put are on a skateboard that uses similar technology in its wheels as an airplane, and you strap the board to your feet so you cant fall off of it.
You strap a jetpack to your back and turn it up full force.
Even if the the treadmill is spinning as fast in the opposite direction as the jetpack is pushing you in the other, you are still going to move forward because all the treadmill is doing is making your wheels spin. The wheels aren't pushing you forward, the jetpack is.
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