How Far Does a Car Travel Accelerating Uniformly from Rest to 20 m/s West?

[kselanders]

Homework Statement

A car accelerates uniformly from rest. If the acceleration was 2.50 m/s^2 west, what was its displacement when it reached a velocity of 20.0 m/s west?

Homework Equations

The Attempt at a Solution

A= 2.50 m/s^2 west
Vi= 0 m/s
Vf= 20 m/s west

vf=vi+at
20m/s=2.50m/s^2(t)
20m/s/2.50m/s^2=t
t=3.2sxf=xi+1/2(vf+vi)t
xf=1/2(20m/s)(3.2s)
xf=(10m/s)(3.2s)
xf=32m

 

[rl.bhat]

Hi kselanders, welcome to PF.
vf=vi+at
20m/s=2.50m/s^2(t)
20m/s/2.50m/s^2=t
t=3.2s
Check this calculation.