A forklift.
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back
Legs
The distance the aircraft travels on the ground before lifting off, or the same when landing.
Physics.
This is true
newton's third law
newton's second law
It contracts
newtons 3rd law
It would be good, if you keep lifting your feet off the ground.
because warm gases rise because they are less dense than normal air, so the hot air from the flame is trapped in the balloon thus lifting it off the ground.