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Ep₂ = ¹/₂ k ∆x₂²
Ep₂ = ¹/₂ F₁ ∆x₂² / ∆x₁
Ep₂ = ¹/₂ 10 (5 10⁻²)² / 2,5 10⁻²
Ep₂ = 5 25 10⁻⁴ / 2,5 10⁻²
Ep₂ = 5 10⁻¹ Joule
Ep₂ = 0,5 Joule