Question

A body weighs W Newton of the surface of the earth. its weight at a height equal to half of the radius of the earth will be a

Answer 1

Ahoy 
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R= 6400km 

W= mg  
g= W/m 
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now the weight of the body at the height = 1/2 of R
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g'= g ( 1- d/R ) 

Weight of the body at the 1/2 R 

W' = W(1- R/2R ) 

W' = W ( R / 2R ) 

W' = 1/2 W Newton

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Hope it helps you : ] 

Answer 2

hope it is correct answer would be 4W/9