# Need Help on Acceleration Problem!

1. Sep 4, 2007

### mpgriffis

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.

2. Sep 4, 2007

### kaisxuans

i'll try this Q...nah, cant get the ans, it is too hard sry cuz i oso g 1239.06g

3. Sep 4, 2007

### Dick

Why are you responding to questions you can't answer? In txt? mpgriffis, convert km/hr to m/sec before you divide by g and time. Carefully. Humans surviving more than a few tens of g's for more than a fraction of a second is unheard of. I have no clue how either one of you got 1238.06g.

Last edited: Sep 4, 2007