A ball is rising towards the surface with a constant velocity in a liquid whose density is four times that of the material of the ball. How many times of its weight is the drag force acting on the rising ball

Let ρ  be the density of the material of the ball, the equation of motion is given by 43πr3ρg−43πr3.4ρg+F=0  ; F = force of friction & r = radius of the ball∴F=43πr3.3ρg  = 3 times the weight of the ball