An object is released from rest at a distance $h$ above the surface of a planet $($mass $=M,$ radius $[\frac{2GMh}{R(R+h)}{]}^{\frac{1}{2}}[\frac{2GM}{R}{]}^{\frac{1}{2}}[\frac{2GM(h-R)}{Rh}{]}^{\frac{1}{2}}[\frac{2GM}{R+h}{]}^{\frac{1}{2}}[\frac{2GM}{R-h}{]}^{\frac{1}{2}}=R$