Question

a men weight 60kg at earths surface. at what heights above the earth surface his weight become 30kg? radius of earth r = 6400kg

Answer 1

(R+ h) ^2/R^2 = 60/30=2
R+h/R = root 2
h = (root 2 - 1) R = ( 1.414-1)*6400=0.414*6400km