As per Newton's Law of gravitation F = G * M * m/R^2 But also F = mg Thus, mg = G * M * m/R^2. In this equation m and m will cancel out to get the final result as: g = G * M/R^2.

G. M. R. Willmott has written:

'The fundamentals of computing'

G R M. Devereux has written:

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M

F = G*m(planet)*m(object)/(r^2)

where F is the gravitational force

G is the gravitational constant

m is mass

r is the distance between the object and the center of the planet

g = G*m(planet)/(r^2)

where g is the acceleration due to gravity.