[tex]\begin{gathered} F=\frac{Gm1\cdot m2}{r^2} \\ \text{If r=2r} \\ \frac{Gm1\cdot m2}{(2r)^2}=\frac{Gm1\cdot m2}{4r^2^{}} \\ Gm1\cdot m2\text{ is constant} \\ \text{Hence} \\ \text{The new force is } \\ F=2N\cdot(\frac{1}{4}) \\ F=\frac{1}{2}N \\ \text{The new force is }\frac{1}{2}N \end{gathered}[/tex]
