Two boxes are arranged so one is on a table and then it is connected to a second by a rope that passes over a pulley and it attached to the second box. The second box is not in contact with any surface. Box A has a mass of 90.0kg and Box B has a mass of 50.0kg. There is a coefficient of friction between Box A and the table that is 0.350. Calculate the Acceleration of the systems.

At a certain instant after jumping from the airplane a, a skydiver b is in the position shown and has reached a terminal (constant) speed vb = 52 m/s. the airplane has the same constant speed va = 52 m/s, and after a period of level flight is just beginning to follow the circular path shown of radius ρa = 2330 m. (a) determine the velocity and acceleration of the airplane relative to the skydiver. (b) determine the time rate of change of the speed vr of the airplane and the radius of curvature ρr of its path, both as observed by the nonrotating skydiver.