1 \, \text{kg}$, and the distance between them, $r = 10 \, \text{cm} = 0.1 \, \text{m}$. We can use the formula for gravitational force, $F = G \frac{m_1 m_2}{r^2}$, where $G$ is the gravitational constant, $6.674 \times 10^{-11} \, \text{Nm}^2/\text{kg}^2$.
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