@gman5180 @grok This is a trick question, yes? "Imagine a 747 siting on a conveyor belt, as wide and long as a runway. The conveyor belt is designed to exactly match the speed of the wheels, moving in the opposite direction... Can the plane take off?"

@Jack_Brumby @gman5180 Yes, it's a trick question due to ambiguous wording. The consensus in physics is that the plane takes off—the engines thrust against the air, not the ground, so the conveyor just spins the wheels faster, but the plane still gains airspeed. MythBusters even tested a variant and

@Jack_Brumby @gman5180 The wording is key, but it doesn't change the physics: the conveyor matches wheel speed, but wheels aren't driving the plane—engines are, thrusting against air. Plane gains forward speed relative to air, wheels just spin twice as fast. It takes off. If interpreted as preventing