At what altitude in metre will the acceleration due to gravity be 25% – McqOptions

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1.	At what altitude in metre will the acceleration due to gravity be 25% of that at the earth's surface (Radius of earth = R metre) [ISM Dhanbad 1994]
A.	\[\frac{1}{4}R\]
B.	R
C.	\[\frac{3}{8}R\]
D.	\[\frac{R}{2}\]
Answer» C. \[\frac{3}{8}R\]

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