Back a ways in this post, someone wrote that speed is more important. They are correct, because you multiply the speed by itself which increases its value A LOT.
That is true , when the arrow weight is the same , but a light "faster" arrow does not have more ke than a heavier "slow" arrow out of the same bow . We are talking stored energy here as it relates to archery . although the quote above is true for the same weight arrows , it does not take into account that in archery the first thing most archers do to get speed is to decrease arrow weight , and a light arrow does not soak up as much energy as a heavy arrow does , during the launching process . Archery's has some parameters that apply to it , although they don't beak the formulas for Ke , and momentum , they do apply to the outcome .
This site is definitely having technical problems