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E = 4 x 10^6 N/m
A = 20 cm² = 20 x 10^-4 m²
l = 5 m
Ditanya : k
Jawab
E = k.l / A
4 x 10^6 = k . 5 / 20 x 10^-4
k = 4 x 10^6 x 20 x 10^-4 / 5
k = 80 x 10^2 / 5
k = 16 x 10^2
k = 1600 N/m