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Originally Posted by Flint
The question does not define "forward speed" in a way that makes the question answerable.
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J Just because they did not tell you which to use as the reference point, then you cannot arbitrarily choose one? Nonsense. See the previous post. Choose air as the reference point. As engines throttle up, velocity of air to airplane increases until takeoff speed is achieved. All this occurs regardless of runway, treadmill, or catapult.
Engine defines a relationship between airplane and air. That makes the problem simple and completely solvable (once we include numbers for engine force, plane mass, and minimum speed for takeoff). It's just not that complex. This is a trivial high school physics problem where a runway / treadmill is completely irrelevant.
So many unable to grasp this so simple problem is scary.