thanks for finding this...
i don't mean to be stubborn but:
well, the explanation to my mind does not fit the problem...the problem states that the conveyor offsets the forward thrust of the engines, such that plane says is the same position, thus no airflow
the explanation claims forward movement will result because the engine thrust is so powerful it overcomes the offsetting force of conveyor against wheels, such that the plane moves forward, airflow results and lift occurs...i believe that is what would occur in a real life test, but the problem stated (i believe) that the plane stays in the same location despite the engine thrust
okay, i done, this fish is finished.






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