设速度为v,
(vt)^2+1/2gt^2=L^2 (1)
(2vt)^2+1/2gt^2=(√3L)^2 (2)
(2)--(1) 得3(vt)^2=2L^2
化简 (vt)^2=2/3L^2代入g=2L^2/3t^2
GMm/R^2=mg M=gR^2/G=2L^2R^2/3t^2G
设速度为v,
(vt)^2+1/2gt^2=L^2 (1)
(2vt)^2+1/2gt^2=(√3L)^2 (2)
(2)--(1) 得3(vt)^2=2L^2
化简 (vt)^2=2/3L^2代入g=2L^2/3t^2
GMm/R^2=mg M=gR^2/G=2L^2R^2/3t^2G