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Ep = 10√2 joule
x = 4 cm
k = ?
Ep = 1/2 .k .Δx^2
10√2 = 1/2 . k . 4^2
10√2 = 1/2.k.16
10√2 = 8 .k
k = 10√2 / 8
k = 1,77 N/m
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