Yes, as a matter of fact I AM getting it. I'm saying you cannot launch an object of that size at ANY useful speed from a magnetic launcher with current technology... If you can point out where there have been actual practical applications of launching large objects at high speeds with a magnetic launcher, please let me know. I've never heard of anything.
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You might try looking at current US Navy plans to launch aircraft off of carriers.
Doesn't make trying to use one for 1/month launches any more sane, much less trying to hit 60,000 feet or so at mach 3.
For those still reading this silliness, going to orbit isn't about height, it's about going mach 20 or you're coming back down. A ramjet will get you all 2% (kinetic energy) of the way there. A scramjet is annother story, but with magic like that the launcher isn't the big story at all (and you would use rockets on anything less than a daily flight schedule).
Launching at 40,000 ft is for when your load is small enough to really care about drag (Pegasus), otherwise it is a drop in the bucket and NASA would rather drop failed rockets in the Atlantic than get 10,000 ft free by launching in Leadville, CO.