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w1/w2 = m1/m2 x r2^2/r1^2
r₁ = R → w₁
r₂ = R → w₂
w₁ : w₂ = __ ?
Berat benda
w = G M m / r²
w berbanding terbalik dengan kuadrat jaraknya dari pusat bumi
w₁ / w₂ = r₂² / r₁²
w₁ / w₂ = (r₂ / r₁)²
w₁ / w₂ = (2R / R)²
w₁ / w₂ = (2)²
w₁ / w₂ = 4 : 1 ← jawaban