F ∝ m / r^2F1 / F2 = (m1 / M2) * (r2 / r1)^2F2 = F1 * (r1 / r2)^2 * (m2 / m1)F2 = F1 * (r1 / (r1/2))^2 * (m1/2 / m1)F2 = F1 * 4/2F2 = 2 * F1F2 = 2 * 20F2 = 40 NForce of attraction will BECOME 40 N
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