It asks to find the vertical force needed to pull the ball in an unknown fluid at a constant velocity. What formulas do I combine and use to find this? They give you the proportionality constant (0.95 kg/s), the constant speed (6cm/s), and the radius of the ball(1.5cm). I already have: F (y direction)= F-(mass)(gravity)-Constant(V) I found mass from the density and volume. The proportionality constant was given as was the velocity. So... F=(mass)*(gravity)-Constant(V) Is this right? Because I haven't been able to find the correct answer using it.