Use the worked example above to help you solve this problem. A block with mass m, = 4.50 kg and a ball with mass m, = 7.40 kg are connected by a light string that passes over a frictionless pulley, as shown in figure (a). The coefficient of kinetic friction between the block and the surface is 0.300. (a) Find the acceleration of the two objects and the tension in the string. a = m/s2 T = N (b) Check the answer for the acceleration by using the system approach. (Use the following as necessary: my, mark and g.) Q = EXERCISE HINTS: GETTING STARTED | I'M STUCK! Use the values from PRACTICE IT to help you work this exercise. What if an additional mass is attached to the ball? How large must this mass be to increase the downward acceleration by 45%? kg Why isn't it possible to add enough mass to double the acceleration