The Physics of Johnny Knoxville, Human Cannonball
The important thing is that this is the equation of a parabola. Looking back at the vertical position data from the video, it at least seems fairly parabolic. Even better, the coefficient in front of the t2 term should be the acceleration divided by two. Using the parabol
https://www.greenground.it/2021/08/14/the-physics-of-johnny-knoxville-human-cannonball/
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