1. The problem statement, all variables and given/known data A world's land speed record was set by Colonel John P. Stapp when in March 1954 he rode a rocket-propelled sled that moved along a track at 1020 km/h. He and the sled were brought to a stop in 1.4 s. In g units, what acceleration did he experience while stopping? 2. Relevant equations I think im supposed to use the constant acceleration equation v = v(0) + at 1 g unit = 9.8m/s^2 3. The attempt at a solution You only get two attempts to get it right. My first attempt was 1239.06 g units but it was wrong. My second time around i got -1239.06 g units but i was just wondering if anyone could double check it. Thanks in advance.