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k1 + k2 = 90 N/m
k3 + k4 = 30 N/m
kemudian mereka diseri. jadi konstanta totalnya
1/K = 1/90 + 1/30
1/K = 1/90 + 3/90
1/K = 4/90
K = 90/4 = 45/2 = 22,5 N/m