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4. Consider the inclined plane shown below. Assume that there is no sliding friction or friction in the axle of the pulley and that the pulley has negligible mass. Also, the mass m, = 20 kg, and the angle is 0 = 30 a) If mass mj is moving up the plane with constant velocity, then what must be the mass of m2? b) Suppose m2 = 20 kg. Then what will be the acceleration of mass m, ? m1 m2 5. Consider again the inclined plane shown above, still with an angle of 0 = 30. Now there is friction. The coefficient of static friction is 0.250, and the coefficient of kinetic friction is 0.123. The blocks have masses m1 = 0.250 kg and my = 0.500 kg a) Show that the blocks will move. In which direction? b) What is the acceleration of the blocks