According to the third Newton's law, "When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction on the first body."
Therefore, we may calculate the modulus of the gravitational force according to Newton's law of gravitation.
"F_{1,2} = G\\cdot\\dfrac{m_1m_2}{r^2} = 6.67\\cdot10^{-11}\\,\\mathrm{N\\cdot m^2\/kg^2}\\cdot\\dfrac{2.5\\,\\mathrm{kg}\\cdot2.5\\,\\mathrm{kg}}{(0.5\\,\\mathrm{m})^2} = 1.67\\cdot10^{-9}\\,\\mathrm{N}."
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