1. The problem statement, all variables and given/known data Terminal speed = 43 m s-1 2. Relevant equations Acceleration in y direction when ball falling down: ay = - g + [itex]\alpha[/itex]vvy where [itex]\alpha[/itex] = K/m and v = (vx2 + vy2)^0.5 3. The attempt at a solution Putting ay = 0 as there is no acceleration when terminal speed occurs. However, is vvy equal to v2, i.e. 432 here? Or do I have to compute its velocity in the y direction?