Car A is starting from rest and accelerating at 4.0 m/s^2, car B passes it

[dasz]

Homework Statement

Car A is starting from rest and accelerating at 4.0 m/s^2, car B passes it, moving at a constant speed of 28 m/s. How long will it take car A to catch up with car B.

Homework Equations

d=Vot+1/at^2

The Attempt at a Solution

Using the equation above, I used it for car A then car B and made them equal to each other. Got 2t^2 - 28t = 0 then solved. I got t= 14s.

Are there any mistakes? Thanks so much.[/B]

 

[gneill]

Your equation and result look fine.