Calculate the terminal speed for a bacterium in water. Use the expression for the drag force in the equation F drag = −Crv . Assume the bacterium has a mass m = 4 10−15 kg, a drag coefficient C = 0.02 N • s/m2 and can be approximated as a sphere of radius r = 1 μm. a. Draw a force diagram for the bacterium. Is it in equilibrium? Why? b.Find the speed (size of the velocity) of the bacterium c.How long does it take a bacterium to fall from the top of a lake of depth 2.5 m to the bottom if it falls at this speed?