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Originally Posted by Flint
"forward speed" relative to what? Not stated.
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The speed is obviously defined by this:
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When the plane's engines throttle up, it begins to move forward,
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Again, a reference to the equations F=ma and v=at . Speed does not exist on its own. Speed is a relationship between two references. Force (the "F") defines those two refeneces. Engine creates a force between airplane and air. Therefore speed is also created / measured between airplane and air. "Forward speed" is defined by that phrase
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When the plane's engines throttle up, it begins to move forward,
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Previously posted are the numbers to stick into those equations so that we know how long (t time) that engine (F force) must push the plane (m mass) to obtain minimum takeoff speed (v speed).