To determine the force we pluf the values given in the problem in the formula:
[tex]\begin{gathered} F_g=(6.67\times10^{-11})\frac{(40)(20)}{(10)^2} \\ =5.336\times10^{-10} \end{gathered}[/tex]
Therefore the force between the spheres is:
[tex]5.336\times10^{-10}\text{ N}[/tex]
