3. A block on an inclined surface is connected to another block that is hanging over the top edge of the incline, as shown in the following diagram. The blocks in the system are moving in such a way that block A (with a mass of 1.0 kg) is moving upwards, as block B (with a mass of 4.0 kg) slides down the ramp. If the rate of acceleration is 1.2 m/s, determine the magnitude of the force of tension in the string and the coefficient of kinetic friction. (9 marks) B A 40