a = (r/(r + h))^2*g
v^2/(r + h) = a
w^2*(r + h) = a
代入得:
v = 6912.79,w = 0.000822951那周期怎么求 ··为什么用用 GMm/(R+H)^2=m4π平方乘以（R+H)除以T的平方 算T算出来答案不对