1. The problem statement, all variables and given/known data Derive an equation for velocity based on time with drag. 2. Relevant equations The equation is: v(t) = F/b (1 - e^(-bt/m)) 3. The attempt at a solution There's some math on paper, but I got down to: F - bv = ma a = dv / dt F - bv = m*dv/dt dt = m*dv / (F - bv) integrate both sides t = m*(-ln(|bv-F|) / b) -tb/m = ln(|bv-F|) e^(-tb/m) = |bv-F| here is where I don't know how to simplify it anymore. What do I do with the absolute value? If I ignore it, it doesn't simplify right, or at least I can't get it to.