at what depth, below the surface of earth, the value of g becomes 25% of its value on the surface of the earth.........
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Explanation:
g=GM/Re² =>at any depth h below the earth
g becomes g'=GM'/(Re-h)².
=M×{(Re-h)/Re}³.
=>h=(3/4)Re=(3/4)×6400=4800km.
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