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Δ x1 = 5 cm
Dit : W2 = ... ? ⇒ Δx = 3 cm
Jwb : W = 1/2 x k x (ΔX)²
W2 / W1 = (ΔX2)²/(ΔX1)²
W2 = (ΔX2)²xW1/(ΔX1)²
= 3² x 75/5²
= 9x75/25
= 27 J