1.F=GMm/(R+h)^2
2.GMm/(R+h)^2=mV^2/(R+h)
GMm/R^2=mg
V=根号g*R/(R+h)
3.GMm/(R+h)^2=m4π^2(R+h)/T^2
根据以上两式去求T
老婆追,自己算吧