8. Using pulleys of negligible friction, three blocks with masses 6.7 kg, 9.2 kg and 8.8 kg are connected as shown below. When released, the 9.2 kg block accelerates to the right at 0.54 m/s-. a = 0.54 m/s What is the coefficient of kinetic friction 9.2 kg between the 9.2 kg block and the horizontal surface in contact with it while sliding occurs? O 1 = ? 6.7 kg 8.8 kg