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Li = 35 cm
F = W = m.g = 0,225 kg x 10 m/s² = 2,25 N
F = K x ΔL
2,25 = 45 x ΔL
ΔL = 2,25/45 = 0,05 meter = 5 cm
Lo = Li - ΔL = 35 -5 = 30 cm
Itu jawabannya. Semoga membantu, dan... kamu manis deh :)