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W = 1/2 k (x₂-x₁)
F = 1/2 × 40 (7-5)
F = 40 N
F = mg
7.
F₁ : F₂ = 1/2 k Δx : 1/2 k Δx
5 : F₂ = 0,07 - 0,05 : 0,1 - 0,05
F₂ = 12,5 N