How much Speed can you take?
                    
                  
                    
                      When a person is subjected to high speed, they
                      feel the effects of G force. G force is the force
                      felt by a person due to acceleration, and 1 G
                      equals the acceleration of gravity, or about
                      9.8m/s^2. Since on a Ferris Wheel the acceleration
                      is the centripetal acceleration pointed towards
                      the center of the circle, one will feel lighter at
                      the top, and heavier at the bottom. As the Ferris
                      Wheel speeds up more and more, as the crazy carny
                      tries to kill the passengers, an average person
                      will faint at 5 G's, or 5 times the acceleration
                      of gravity, and if the G force levels are
                      not reduced, can be proven fatal. Since the
                      G-Force is not a matter of velocity but of
                      acceleration, there isn't a specific speed in
                      which a person will die from if exposed to, but if
                      the Ferris Wheel were to constantly speed up until
                      5 times the acceleration of gravity, around
                      50m/s^2, then it will prove to be fatal.