[monday]

"Velocity has no bearing on perceived weight"

I think he meant that the acceleration and deceleration necessary would be impossible if one were to accelerate to 7,200 mph and back to 0 mph again within a 20 minute trip between Washington DC and San Francisco.

Actually in order to make it in 20 minutes, a jet would have to accelerate to approx. 7,500 mph instantly, fly at that speed for 20 minutes, and then decelerate to 0 mph instantly, to land in San Francisco.

[Jack of all Trades]

If that's the case, then one of my original assumptions was wrong - oops.