At what height from the surface of the earth will the value of g be reduced to 1/4th the value at the surface of earth? Radius of earth is 6400
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g=GM/d^2
g'=g*R^2/(R+h)^2
g'/g=R^2/(R+h)^2
1/4=R^2/(R+h)^2
1/2=R/(R+h)
2R=R+h
h=R=6400km
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