Problem # p015

A small drop of water is released from a cloud with initially zero velocity. It's subsequent speed is determined by gravity (g=9.81 m/s²) and air resistance which is proportional to the square of the velocity :

For a spherical rain drop of 6 mm ( about 1/4 inch ) diameter we have :

Force of air resistance = k * v2     with k =7.35*10-6[kg/m]     v = velocity [m/s]

Force of gravity : 1.1*10-3 [N]