Col. john stapp led the u. s. air force aero medical laboratory's research into the effects of higher accelerations. on stapp's final sled run, the sled reached a speed of 284.4 m/s (632 mi/h) and then stopped with the aid of water brakes in 1.4 s. stapp was barely conscious and lost his vision for several days but recovered. a)determine his acceleration while stopping. b)determine the distance he traveled while stopping