Boxes A and B are connected by a cable that is parallel to their resting plane as illustrated in figures 1 and 2. The static and kinetic friction coefficients for each box are ?sA = 0.25, ?kA = 0.19, and ?sB = 0.35, ?kB = 0.27, respectively. 1) Assuming the plane on which the blocks rest is horizontal and applying a force P at an angle of 25: a) Draw the free body diagram of boxes A and B (figure 1); b) Determine the force P that can be applied to keep both boxes moving (at constant speed) if both boxes have a mass of 100 kg. 2) By gradually tilting the angle ? of the plane on which the two boxes rest: a) Draw the free body diagram of boxes A and B (figure 2); b) Determine the angle ? at which the boxes start to move if the masses of boxes A and B are 100 kg and 80 kg, respectively.