Calculate the terminal speed for a bacterium in water. Use the expression for the drag force in Equation 3.23. 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. How long does it take a bacterium to fall from the top of a lake of depth 5.0 m to the bottom?