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2015-09-10T23:17:09+05:30

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F = m g' = G M_e m / (R+d)²
      m = mass of an object at a distance d from the surface of Earth.
   M_e = mass of Earth.
   G = universal gravitational constant.
   R = radius of Earth

   g' = G M_e / (R + d)²

let  g = acceleration due to gravity at the surface of Earth
   m g = G M m /R²
   =>  g = G M_e / R²
 
   g' / g = R² / (R+d)²  = 6400² / (6400+12800)² = 1/9

   g' = g / 9 =  9.81/9 = 1.09 m/s²      taking g = 9.81 m/s²

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