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v = 10 m/s
∆x = 0,5 m
k = __?
Ep = Ek
1/2 k ∆x^2 = 1/2 m v^2
k = m v^2 / ∆x^2
k = (1) • (10^2) . (1/2)^2
k = 400 N/m. <-- jawaban
Ok ?