1. The problem statement, all variables and given/known data The disk rolls without slipping on the horizontal surface, and at the instant represented, the center O has the velocity vO = 2.2 m/s and acceleration aO = 5.5 m/s2 with directions shown in the figure. For this instant, the particle A has the indicated speed u = 3.2 m/s and time rate of change of speed = 6.6 m/s2, both relative to the disk with directions shown in the figure. Determine the absolute velocity vA and acceleration aA of particle A. I have attached an image of the question 2. Relevant equations VA = VO + wXr + Vrel 3. The attempt at a solution I'm honestly confused as to how to start this question. I'm not given the angular velocity so initially I tried to solve for it. v = wXr I know that the velocity at point O is -2.2i but how should I determine r? Or should I use the velocity at A instead? Any help would be appreciated.