Newton's universal law of gravitation is expressed as
F=G×m1m2÷r2
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g is the local acceleration due to gravity between 2 objects. ... You get this value from the Law of Universal Gravitation. Force = m*a = G(M*m)/r^2. Here you use the radius of the earth for r, the distance to sea level from the center of the earth, and M is the mass of the earth.
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