A raindrop of mass 3.15 x 10"s kg falls vertically at constant speed under the influence of gravity and air resistance, Model the drop as a particle. (a) As it falls 145 m, what is the work done on the raindrop by the gravitational force? The answer to this part would not change if the air resistance force was not present. ] (b) What is the work done on the raindrop by air resistance? Draw a picture of the drop showing the air resistance force and the velocity, ]