[icegreentea2]

I suspect it means humans.

So here's one way to think about the accelerations. To a first approximation, you need the same total change in velocity to go from standing on the surface of an object to be in orbit at a given altitude. You can choose to spread that change in velocity over any given time and distance interval (those two terms are linked). So if your mass driver accelerates your payload to final velocity in 1/10th the time (and more or less distance), you will get 10x the acceleration.

So the forces you would be subject to will be more or less directly related to how large of a mass driver (in terms of track length) it is relative to the mass of the object you are leaving.