Given that acceleration due to gravity \( (\mathrm{g} \) ) varies i...

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Given that acceleration due to gravity \( (\mathrm{g} \) ) varies inversely as the square of the distance from the
\( \mathrm{P} \) centre of the earth. Find its value at a height of W \( 1600 \mathrm{~km} \) from the earth surface. The value of ' \( \mathrm{g} \) ' at the surface is \( 10 \mathrm{~ms}^{-2} \).
Radius of the earth \( =6400 \mathrm{~km} \).
(1) \( 6.4 \mathrm{~ms}^{-2} \)
(2) \( 5 \mathrm{~ms}^{-2} \)
(3) \( 10 \mathrm{~ms}^{-2} \)
(4) \( 7.2 \mathrm{~ms}^{-2} \)
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