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Δx1=x1-x0
Δx1=22-20=2 cm
F1=37,5
Δx1=?
F1/Δx1=F2/Δx2
12,5/2=37,5/Δx2
12,5Δx2=2 .37,5
Δx2=6cm
Δx2=x2-x0
x2=x0+Δx2
x2=20+6
x2=26cm
F₁ = 12,5
L₁ = 22cm --> ΔL₁ = 22-20
= 2 cm
k = F₁/ΔL₁
= 12,5 / 2 N/cm
F₂ = k. ΔL₂
37,2 = 12,5 / 2 . ΔL₂ --> ΔL₂ = 37,5/12,5 . 2
= 6 cm
L = L₀+ΔL₂
= 20 + 6
= 26 cm