A body weighs 30 kg on the surface of the earth how much would it weigh on the surface of a planet whose mass is 1/9 the mass of earth and radius is half of that of earth?
Weight on earth = 30 kg wt = 30 x g N
g on new planet, g’ = GM’/R’2=(4/9)g
Therefor weight on the new planet will be equal to 4/9 times its weight on earth
(Whereas the mass will be the same)