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how did newton find the value of 'g' with the help of inverse square law?
     Consider  a body of mass = m

According to the law of Gravitation ,
                   F =GMm/r²                ,,,,,,,,,,,,,, (1)
           Where F is the force of attraction between the body of mass m and the earth.
               G= universal Gravitational Constant
               r = distance between the center of masses.

       Also ,
           we know that earth attracts a body with a force given by
                   F=mg                      .......(2) 

from 1 and 2 , we gt
               mg = GMm/r²
               or g =GM/r²

Hope this helps You!!!
2 1 2
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