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Explanation:
The gravitational force between two objects at distance r is given by,
[tex]F = G \frac{m_1 m_2}{ {r}^{2} } \\ [/tex]
Where G is gravitational Constant, and the value is approximately
[tex]G = 6.672 \times {10}^{ - 11} \frac{N {m}^{2} }{ {kg}^{2} } \\ [/tex]
Now lets calculate the force produced between object a 20 kg and object B 40 kg at a distance 5 m.
[tex]F = G \frac{m_1 m_2}{ {r}^{2} } \\ = (6.672 \times {10}^{ - 11}) \frac{(20 )(40)}{ {(5)}^{2} } \\ = \frac{(6.672 \times {10}^{ - 11})(800)}{25} = 2.13 \times {10}^{ - 9} N[/tex]