# Finding acceleration using velocity

1. Sep 13, 2011

1. The problem statement, all variables and given/known data

A race car starts from rest and travels east along a straight and level track. For the first 5.0 s of the car's motion, the eastward component of the car's velocity is given by vx(t)=(0.940 m/s3)t2
2. Relevant equations

I think I am suppose to use the equation x-x0=(v0+v)/2)t

3. The attempt at a solution

I know the givens are x0=0 and t=5.00s, but I don't know how to use vx to solve for acceleration. Thanks.

You guys didn't happen to obtain7.46 m/s^2 as the answer, did you?

Last edited: Sep 13, 2011
2. Sep 13, 2011

### ehild

No, that relation is valid between displacement and velocity for a special kind of motion, what is it? Is it the same as the motion in the problem?

Do you need to get the displacement or the acceleration?

Hint: how is velocity and displacement related in general? How is acceleration defined?

ehild

3. Sep 13, 2011

ok thanks! I just figured it out. =)