Arm ACB rotates about Point C with an angular velocity of 40 rad/s counterclockwise. Two friction disks A and B are pinned at their centers to arm ACB as shown. Knowing that the disks roll without slipping at surfaces of contact, the velocity of disk B was found to be v = 72j (vertical) at the instant in time shown. What is the velocity of the point of contact E between disks A and B. 2.4 in. 0.3 in.- 1.8 in. 1.5 in. 0.6 in. D Point E is where both disc touch E