A sphere of mass `40 kg` is attracted by a second sphere of mass `15 kg`, when their centres are `20 cm` apart, with a force of `0.1` miligram weight. Caculate the value of gravitational constant.

Explanation

To calculate the value of the gravitational constant \( G \), we can use Newton's law of universal gravitation, which states:

\[ F = \frac{G \cdot m_1 \cdot m_2}{r^2} \]

where:
- \( F \) is the gravitational force between the two masses,
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