Fg=G*[(m₁*m₂):r²], G=6,67 *10^-11

. ma_g=GmMp:R_p² a_g=GMp: R_p²

Fd=(mV²):r=m ²r, Fg=Fd, V²=(GMs):Ro

V_I²=(GMz):Rz, =(2:T, Rs³=(GMzT²):(4²)