Quote:
Originally posted by MattyX:
Neither matters.
Actually, it does.

If the plane's speed is relative to the belt, the ONLY speed that can be matched by the belt is zero. Otherwise, it's caught in a infinite speed curve up (meaning the belt can't match it). Example - if the plane is moving 2mph relative to the belt, the belt has to go 2mph in the opposite direction - but then the plane is actually moving at 4mph relative to the belt - then the belt has to go 4mph...but then the plane is going 8mph relative to the belt...and so on and so on.

If the plane's speed is relative to the ground, then it takes off no problem, and the belt can match it's speed. In which case, the belt has absolutely no bearing on the plane's movement.
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"Nature has constituted utility to man the standard and test of virtue. Men living in different countries, under different circumstances, different habits and regimens, may have different utilities; the same act, therefore, may be useful and consequently virtuous in one country which is injurious and vicious in another differently circumstanced" - Thomas Jefferson, moral relativist