Science

How hard would it be to kinetically launch mass to escape velocity without it burning up in the atmosphere? 

If we built an electromagnetic launch rail atop Mount Everest on 1 kilometer-tall pylons to begin with as thin of an atmosphere as possible, how long would it need to be to hypothetically work?

We need cheaper and more sustainable ways to enter space.

Would floating a launch rail at, say, 10km altitude with balloons and tethering it with a very long power cable—then floating payload up to it—be more feasible?

I think for crewed it can be something like 3g constant acceleration for 170 miles:

Chocolate rainmaker. Singer. Thinker. Voice

I think for crewed it can be something like 3g constant acceleration for 170 miles: https://en.wikipedia.org/wiki/StarTram#Generation_1.5_System_(lower-velocity_option)