F=G * M1 * M2/r2 

 where ,
    f = force of attraction
   M1 & M2 are the masses 
  G = gravitational constant 
  r = distance or radius 


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         F = G M  m  / R²

  Force F
   G = universal gravitational constant
   M = mass of Earth
   m = mass of an object on the surface of Earth
   R = radius of Earth
   g = acceleration due to gravity  = G M / R²

then  F = m g

1 5 1
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