let's say I'm too dumb and also under drugs right now and can't figure this out on my own. call me a retard if you want. let's say I have a lander and I need a function to know either when ot at which height I should start an engine pointed downwards with constant twr, accounting for the change in g, to land softly when in vertical trajectory knowing height and speed at a particular point in time. what would that function be?
