Two issues with this: Firstly, the minecraft g constant was set to 9.8 m/s2 and not determined experimentally as minecraft is, simply put, not actually earth (the world is actually much larger than earth technically). The second issue is simply a derivative of the first issue in that g is used in the calculations twice so the error has potential to compound itself if there is any error. It is useful to consider that the physics engine of the game, while it may attempt to mimic real life physics, will inevitably fall short of irl classical physics because of complexity and modeling as realistically as possible deviates from goals from a game and development perspective, so its useful to ask oneself, What is the game actually trying to do in this situation? What is actually happening underneath, and what is the engine actually doing? While these questions likely cant be answered without delving into the code, it is useful to keep in mind because some of these answered can in fact be glimpsed experimentally with enough data.
