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G • m
g = _____
R²
Karena nilai G • m = konstan, maka didapat persmaaan :
g₁ • R₁² = g₂ • R₂²
g • R₁² = ¼g • R₂²
1 • R₁² = ¼ • R₂²
R₁² = ¼R₂²
R₁ = √¼R₂²
R₁ = ½R₂
R₂ = R₁/½
R₂ = 2R₁
Jadi, jari jarinya harus menjadi 2R (Jawaban B)