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I a not sure wether to use hookes law (f=ks) or the kinetic energy formula Ek = .5kmv^2

when i used hookes law i got an answer of 0.04 but when i use the kinetic energy forumla i got 0.57. I know it doesnt really make any sense to use hookes law as u cant find the force, only the momentum (0.4x 8)

any help with this would be greatly apreciated