Quote:
Originally posted by Mobycat:
But we are not assuming a headwind. We are assuming calm air. If the plane overcomes the headwind/water (conveyor belt), then the puzzle is flawed - because that would mean the conveyor belt has NOT matched the speed of the wheels.[/QB]
For this analogy:

Headwind=headwater

Calm wind= calm water

conveyor underfoot=conveyor overhead

headwind DOES NOT = conveyor

Headwater DOES NOT = conveyor