The fastest path involves a small dip, though deriving that fact is non-trivial! Here's one of my old blog posts where I do the derivation: https://jasmcole.c

The fastest path involves a small dip, though deriving that fact is non-trivial! Here's one of my old blog posts where I do the derivation: https://jasmcole.com/2020/04/13/briechistochrone https://jasmcole.com/2020/04/13/briechistochrone