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F=18 N
a.K=..?
b.Ep=..?
jawab:
a.K=F/Δx
K=18/0,25
K=72 N/m
b.Ep=1/2.k.x^2
Ep=1/2.72.0,25^2
Ep=36.0,0625
Ep=2,25 J