A body weight 144 N at the surface of earth. When it is taken to a height of h =3R, where R is radius of earth, it would weight-
(I) 48 N (II) 36 N (III) 16 N (IV) 9 N

g is the acceleration due to gravity at the surface of the earth.g' is the acceleration due to gravity at the height =3Rg'g  = RR+h2 = RR+3R2 = 116weight at the height = 3R is given byw'w = mg'mg = 116w' = w16= 14416 = 9 N

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