Drift Speed in a Conductor

anonymousphys

1. The problem statement, all variables and given/known data
v=qEt/m
t=time between each collision
q=charge on particle
m=mass of particle
E=electric field

Why is this the average velocity/drift speed in a conductor?



2. Relevant equations



3. The attempt at a solution

Doesn't qEt/m = the final velocity of the particle. So isn't the average velocity qEt/(2m)?
Is there something missing in my logic?

Thanks for any help.

anonymousphys

Still not too sure about this problem. Any help would be much appreciated.

anonymousphys

In in introductory physics, do we just assume qEt/(2m) = qEt/(m) because the values are so small?