Answers

2015-01-08T20:37:40+05:30
force=G x M x m/r²
force= mass x acceleration
Here, in fee fall acceleration is equl to gravity
m x g=G x M x m/r
²
by cutting m on both the sides we get
g=G.M/r
²
g is the acceleration due to gravity, G is the universal gravitational constant, r is the radius, m is the mass of the body & M is the mass of the planet. 
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