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it all depends on jump size and how far you want to go. if you want to go a 100ft go 100 mph.
thos guys in long jump go 300 of the lip
i guess it would have to do with trajectory, and some wind speed. if the jump is 100 feet, but the lip is low as fuck, your gonna have to mach at it to get to the landing, but if the lip is poppy, it will send you up and you will have all that air time for it to take you across the gap, and thus you don't have to hit it as fast
physics apporach: the horizontal component of velocity, once in the air won't change (except for drag) but the vertical component will, based on the shape of the lip, so basically the poppier the lip (to and extent) the more hang time you will have, and thus the more distance in the air you can travel