# Quarter mile run times:

sonhouse
Posers and Puzzles 21 Jul '08 04:23
1. sonhouse
Fast and Curious
21 Jul '08 04:231 edit
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. 21 Jul '08 09:511 edit
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
3. sonhouse
Fast and Curious
21 Jul '08 11:13
Originally posted by David113
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
Close enough! It kinda shows we seem to be pretty much maxed out accel-wise, eh. They are already pushing 5 g's now so at some point they would start to black out, so I don't see the times getting under 4 seconds in the foreseeable future.