(1)地表的加速度为g，地球的质量是MG=F引mg=GMm/R^2M=gR^2/GF离=F引ma=GMm/(R+h)^2a=GM/(R+h)^2 =G*gR^2/G(R+h)^2 =gR^2/(R+h)^2(2)a=v^2/(R+h)=gR^2/(R+h)^2v^2=gR^2/(R+h)v=R√[g/(R+h)]
