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2015-09-12T19:01:33+05:30

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G = G M_e / R²    on surface of Earth,  R = radius of Earth

Me = mass of Earth
G= universal gravitational constant
g = acceleration due to the gravitational force
g depends on  d , which is the distance between objects.

Force = m g =  G M m / d²
     g =  G  M / d²

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