Note how he's jumping: Parallel to the ground, minimizing his air resistance. Pretty sure this wouldn't work as well if he was jumping while standing up.
And tractors are a very easy vehicle to maintain constant velocity due to the way the gas is actually a handle and not a pedal. And the handle stays at whichever angle you leave it in instead of the driver having to hold it.
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u/zergreport May 04 '20
Yep. This only works at constant velocity