Calculate the velocity a spherical rain drop would achieve

Question

Question: 1) Calculate the velocity a spherical rain drop would achieve falling (taking downward as positive) from 5.4 km in the following situations. h = 5.4 km l = 4.2mm d= 1.16 kg/m³

a) Calculate the velocity in the absence of air drag in m/s

b) Calculate the velocity with the air drag in m/s. Take the size across of the drop to be 4.2mm, the density of the air to be 1.16 kg/m³, the density of water to be 1000kg/m³, the surface and the area to be Ï€r², and the drag coefficient to be 1.0.