At fixed drive, a larger linear-drag coefficient lowers the checked terminal speed. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
Twelve divided by two gives six metres per second
Hold drive at 12 N. Coefficient 2 N*s/m gives terminal speed 6 m/s when drag balances drive.
12/2=6
Three gives the four-metre-per-second base speed
With the same drive, coefficient 3 N*s/m gives terminal speed 4 m/s and balanced drag 12 N.
12/3=4
Four lowers the speed to three metres per second
Coefficient 4 N*s/m gives terminal speed 3 m/s. The claim is only a drive-drag balance, not a cell-signaling model.