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g1/g2 = GM/r1² x r2² / GM
9.8/4.9 = r2²/r1²
r2 = √2r1²
r2 = √2 r1
ketinggian benda = r2 - r1 = 1.4r1 - r1 = r1 (√2 - 1) = 2638.54 km