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 Mass of Earth, M = 6 × 1024 kg Mass of object, m = 1 kg Universal gravitational constant, G = 6.7 × 10−11 Nm2 kg−2 Because object is on the surface, the distance “r” is equal to the radius of the earth.  r = 6.4 × 106 m By putting in all the values,  the gravitational force is   
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