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This talk about airplanes is very interesting, but I wonder which takes more energy: To lift a heavy plane to 10,000 feet or to lift a light weight plane to 10,000 feet. If the engine off glides are the same, then the only critical phase is what happens when the airplane is climbing.
And wouldn't this apply to taking a vehicle at rest and accellerating it to a speed? More weight would take more energy. And of course, if you use the brakes, all that energy is lost.
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