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12,5 = K (22-20)
12,5 = K (2)
K = 12,5 / 2
K = 6,25
37,5 = 6,25 ΔX
ΔX = 37,5 / 6,25
ΔX = 6
xt₁ = 22cm maka, Δx₁ = 22-20 = 2cm
F₁ = 12.5 N
F₂ = 37.5 N
k = F/Δx
k₁ = k₂
F₁/Δx₁ = F₂/Δx₂
12.5 / 2 = 37.5 / Δx₂
6.25 = 37.5 / Δx₂
Δx₂ = 37.5 / 6.25 = 6cm
xt₂ - x₂ = 6cm
xt₂ - 22 = 6cm
xt₂ = 28cm