Question

what is the force of attraction between a - 3kg mass and a 6.2kg object when they are seperated at 0.6km?

Answer 1

The Newton's law of gravitation says

$$F=G\frac{m_1m_2}{r^2}\\ =6.67\times 10^{-11}\frac{3.0\times 6.2}{(600)^2}=3.45\times 10^{-15}\:\rm N.$$