2.) A roller mechanism R with radius 25 cm is connected to a cord as demonstrated in Fig. 2. The cord is wrapped around a groove that is 15 cm away from the mass centre of the roller. The roller is initially standing at rest on a declined surface ( = 20). R Figure 2 Noting that the mass of the roller is 75 kg, and its radius of gyration about its mass center is 0.2 m, and taking us = 0.4 and uk = 0.3; a) Calculate the roller's angular velocity, 5 seconds after it is discharged [28%]. b) Discuss three ways or system adjustments that could be made, to increase this angular velocity value at this position [9%].