ok, this is such a stupid issue… I have about 200+ references from books, videos, articles, studies, round the table convos, etc etc from coaches all over the world saying that the two MOST IMPORTANT elements of long jump distance are horizontal velocity AND take off angle. If 2 people with the same leg length and landing abilities wanted to jump 8m. One runs 10.5 m/s and the other ran 10m/s, the slower one would HAVE TO HAVE a bigger take off angle…its just that simple.
Nick is correct up to a point on the take-off angle, it’s up to the optimum take off angle involved based around momentum at the center of mass. However if both jump at their optimum angle the faster one wins.