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.