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Q.

If R is radius of earth then the height above earth surface at which acceleration due to gravity reduces by 75% of its value on earth surface :

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a

R/2

b

2R

c

3R

d

R

answer is D.

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Detailed Solution

75 % of g reduces meansg′=27% of g′=g4g′=g1+hR2=g4⇒h=R
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