Obligatory xkcd: https://what-if.xkcd.com/58/ https://what-if.xkcd.com/58/ In short, gaining altitude, even 3000m, isn't that hard for a rocket. The problem i

Obligatory xkcd: https://what-if.xkcd.com/58/ https://what-if.xkcd.com/58/ In short, gaining altitude, even 3000m, isn't that hard for a rocket. The problem is that they have to go fast.