2. Express the magnitude and direction of the net force on each of the following. Justify your answers with principles of physics. (KU) a. A drop of rain falling at constant speed b. A cord with a mass of 10 g floating on still water C. A stone with a mass of 0.1 kg just after it is dropped from the window of a stationary train d. The same stone at rest on the floor of a train, which is accelerating at 1.0 m/5