The cycloid is an example of a brachistochrone curve and the one described would be ~254km tall. Watch out for satellites. Disregarding friction, Marei would exit the bottom traveling at 2200 meters per second. Whoever is standing at the bottom in Osaka gains recognition as the first person to be killed by a hypersonic lesbian.
Yes! I feel like this is (understandably) the first big glimpse into their actual studying so far, unless I'm forgetting something. I love learning about stuff like this. Let's go math(s)!