A point mass when enters \( d \) depth below the earth's surface such that the \( g \) reduces b....

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A point mass when enters \( d \) depth below
\( \mathrm{P} \)
the earth's surface such that the \( g \) reduces by \( 1 \% \) then find the value of \( d \) (in \( \mathrm{km} \) ) [Take \( R_{\mathrm{e}}=6400 \mathrm{~km} \) ]


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