If the radius of Earth is 6000 km, what will be the weight of 120 kg body (in kg Wt.) if  taken to a height of 2000 km above sea level (i.e., surface of the Earth).

With usual notation, R = 6000 km, h = 2000 kmIf g and gh denote the values of acceleration due to gravity on the surface and at a height h, thenghg=R2(R+h)2=(6000)2(6000+2000)2=36×10664×106 or ghg=916Thus, the weight at a height of 2000 km        =916(120 kg)=67.5 kgwt