Question: Calculate the speed (in m/s) a spherical rain drop would achieve falling from 2.10 km in the absence of air drag and with air drag. Take the size across of the drop to be 9 mm, the density to be 1.00 ? 103 kg/m3, and the surface area to be pr2. (Assume the density of air is 1.21 kg/m3.) (a) in the absence of air drag 202.985 m/s (correct) (b) with air drag 9.8687 m/s (incorrect)