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F2 = ?
F sebanding dengan r^2
F1 / F2 = r1^2 / r2^2
160 / F2 = r^2 / (2r)^2
160 / F2 = r^2 / 4r^2
160 / F2 = 1/4
F2 = 160 . 4
F2 = 640 N