I think it's fairly normal for that to occur.
yea that is weird.....kinda like motion sickness....Its like when you jump on a trampoline and jump off - still feels like you jumping..... Think its normal or not...dunno?! sure it won't last long
I would say it's due to the velocity of the ride, and it will ease off in a few hours, and also due to an adrenaline rush as well.