Aspherical raindrop 2.5 mm in diameter falls through a vertical distance of 3900 m. take the cross-sectional area of a raindrop = πr2, drag coefficient = 0.45, density of water to be 1000 kg/m3, and density of air to be 1.2 kg/m3. (a) calculate the speed (in m/s) a spherical raindrop would achieve falling from 3900 m in the absence of air drag. m/s