1. The problem statement, all variables and given/known data A ball travels vertically upward with quadratic air resistance, find the acceleration component. 2. Relevant equations So, I have x pointing vertically downward and C=0.20 D = Diameter V=velocity W= -mgi R = -C^2D^2V^2 F=ma ma= -mg-C^2D^2V^2 3. The attempt at a solution a(t)= dv/dt dv/dt = (-mg-C^2D^2V^2)/m After doing the integration it seems not to make any sense. Any help where I have gone wrong? Am I along the right lines?