# Homework Help: Gunits of acceleration

1. Oct 20, 2009

### baylayA

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. Oct 20, 2009

### SlainTemplar

Im pretty sure (correct me if I'm wrong) but this forum is for help on a question not the answer, what exactly are u struggling with?

3. Oct 20, 2009

### baylayA

I don't know what formula to use

4. Oct 20, 2009

### SlainTemplar

What are your givens and your requirements. Writing those down makes finding the correct formula to use easier

5. Oct 20, 2009

### baylayA

i have km/hr of how fast he was moving and how many seconds it took for him to stop and i need to find G units of his acceleration while he was stopping.

6. Oct 20, 2009

### SlainTemplar

okay so you have time, and velocity and your looking for acceleration. But Velocity can be split into V1(Initial) and V2(Final) so what was his initial velocity and final velocity?

7. Oct 20, 2009

### baylayA

That is the only velocity given so I'm not sure.

8. Oct 20, 2009

### SlainTemplar

Well Hes starting with a speed and hes comming to a stop.

9. Oct 20, 2009

### baylayA

oh so it's original and then 0 is the final?

10. Oct 20, 2009

### SlainTemplar

Thats right. so you have v1, v2, and t, and your looking for acceleration so what formula has all of those variables in it

11. Oct 20, 2009

### baylayA

a= vf-vo
_____
t

thank you!

12. Oct 20, 2009

### baylayA

but how do you get it into G units?

13. Oct 20, 2009

### SlainTemplar

anytime, Glad i could help, don't forget to convert to g's, the conversion factor is:
1g = 9.81 m/s^2

basically 1g is the acceleration of gravity