When we refer to the term terminal velocity, we will therefore understand that the velocity is constant at that point. For this, if the speed is constant, the acceleration is zero.
Taking Newton's second law as a reference, we have that the force is equivalent is the product between mass and acceleration, therefore
[tex]F= ma[/tex]
Since acceleration is the change of speed in an instant of time, we have to
[tex]F =m \frac{\Delta V}{t}[/tex]
However, the change in speed is zero since this is constant, so we will have to
[tex]F= (10)(0)[/tex]
[tex]F = 0[/tex]
Therefore the net force will be zero.