12. Two masses are connected together by a string which is then hung over a pulley which is mounted on the ceiling as shown in the diagram to the left. Mass m, = 7.50 kg and mass my = 6.50 kg. Initially mass my is suspended h = 135 cm above the floor while mass my is sitting on the floor. a. What will be the net [unbalanced] force on this system? III b. What will be the resulting acceleration of this system ? c. What will be the tension in the string as my accelerates to the floor ? d. How long will it take for my to reach the floor? h e. What will be the velocity of my just as it reaches the floor