I'm not sure if this is the correct place to ask, but I was looking up some of the fastest vehicles in the world, with the Thrust SSC recorded to have traveled at 771 mph. On top of that many aircraft are capable of moving at speeds over 1500mph. So I was wondering how well can humans comprehed what they are seeing at those speeds? What would their reaction time be? Also what kind of G-Forces are they feeling? Is there an equation for calculating G forces at X speed? Thanks in advance.