1. The problem statement, all variables and given/known data See problem here: http://i184.photobucket.com/albums/x153/spl10246/problem.png Solution: http://i184.photobucket.com/albums/x153/spl10246/solution1.png http://i184.photobucket.com/albums/x153/spl10246/solution2.png 2. Relevant equations p = m * v K = .5 * m * v^2 U = m * g * h a = dv/dt v = dx/dt 3. The attempt at a solution I've gotten A and C fine, I'm still working to get B. D is the trouble part. F_net = m * a Only force acting is -bv m * a = -bv m * dv/dt = -bv dv/dt = -bv / m dv = -bv/m * dt dv/v = -b/m * dt At this point the published solution makes no sense to me at all. I am used to just putting an indefinite integral on both sides at this point. My confusion is about the bounds. Why is the left side v_0 to v? I understand the steps after setting up the integrals (including evaluating the integrals and using log properties and so on).