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rab=r1+r2
2=r1+r2
r1=2-r2
ga=gb
Gma/r₁²=Gmb/r₂²
ma/r₁²=mb/r₂²
16/(2-r₂)²=4/r₂²
4/2-r₂=2/r₂
4-2r₂=4r2
4=6r2
r₂=2/3=0,67m dari b