Problem 5. A stone of mass m is thrown straight up into the air with speed vo. While in flight, it feels a force of air resistance of magnitude fair:

Determine the speed of the stone when it hits the ground. Your answer will contain fair, m, g and vo. You will need to write an equation using either the work energy theorem or the conservation of mechanical energy for the upward path and for the downward path. You will then need to combine the two equations to get the answer. Additionally,for both the upward and downward paths, provide a sentence or two which describe the energy transformations which occur in the system.