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Questions  

A body weight W newton at the surface of the earth. Its weight at a height equal to half the radius of the earth will be

a
W2
b
2W3
c
4W9
d
8W27

detailed solution

Correct option is C

g'=g RR+h2=g RR+R22=gR3R22=49g      ∴  W'=mg'=m4g9=49W

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