Cavendish measured the gravitational constant "G".
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g, the force of the Earth's gravitational attraction, is not a constant.
U = m g h Where U is Gravitational Potential Energy (measured in Joules) m is Mass (measured in kilograms) g is Gravitational Acceleration (~9.8 meters/second2) h is height (measured in meters)
It is m3kg-1s-2
Gravitational constant was determined by lord Henry cavendish in 1798 using a torsion balance .....G=6.67 *10^-9
The gravitational constant denoted by letter G, is an empirical physical constant involved in the calculation(s) of gravitational force between two bodies