kinetic energy: "E_k=\\frac{1}{2}mv^2"
momentum: "p=mv"
where "v" - velocity, m - mass
"\\implies p=\\sqrt{2mE_k}"
if "E_k" is increased by a factor of 8 then "p" is increased by a factor of "\\sqrt8 \\approx2.8"
Answer: "\\sqrt8 \\approx2.8"
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