🚀 Escape Speed — ve = √(2GM/R), the speed that never comes back

Real Newtonian flight in SI units, not a lob: the projectile is integrated under a = −GM/r² all the way out. Only SPEED decides escape — not direction, and not the projectile's own mass. Escape speed is the one number this scene is about.
ve = √(2GM/R) = 11.2 km/s · vc = √(GM/R) = 7.9 km/s
v / ve = 0.80 · g = GM/R² = 9.8 m/s²
E/m = ½v² − GM/r = − MJ/kg → bound
KE/m = — · PE/m = — MJ/kg
r = 1.00 R · altitude h = 0 km
apoapsis — · flight time t = 0 s
STATUS: launching…
ve is independent of m — change m and ve does not move