*Originally posted by sonhouse*

**Assuming constant acceleration (which we all know not to be true in a real quarter mile run) how many G's do you have to achieve to go through the quarter mile in 2 seconds?
**

How many G's to do the quarter mile in 1 second?

2 seconds:

average velocity = 1/8 mile/sec

max velocity = 1/4 mile/sec

acceleration = from 0 to 1/4 mile/sec in 2 seconds, so acceleration = 1/8 mile/sec^2 ~ 200 m/sec^2 ~ 20 g

1 second:

average velocity = 1/4 mile/sec

max velocity = 1/2 mile/sec

acceleration = from 0 to 1/2 mile/sec in 1 second, so acceleration = 1/2 mile/sec^2 ~ 800 m/sec^2 ~ 80 g