Q.

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)

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a

14R

b

R

c

38R

d

R2

answer is B.

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Detailed Solution

g′=gRR+h2⇒g4=gRR+h2⇒12=RR+h⇒R+h=2R ∴h=R
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