A simple friction drive consists of two disks A and B. Initially, disk A has a clockwise angular velocity of 500 rpm and disk B is at rest. It is known that disk A will coast to rest in 60 s However, rather than waiting until both disks an- at rest to bring them together, disk Bis given a constant angular acceleration of 2.5 rad/s2 counterclockwise. Determine (a) at what time the disks can he brought together if they are not to slip. (b) the angular velocity of each disk as contact is made. 60 mm B.