1. The problem statement, all variables and given/known data A particle moves with constant speed around a circle. When it is at the top of the circle, its coordinates are x=0 and y=2 and its velocity is 4(m/s) i. When it reaches the left hand of the circle, where its coordinates are now x=2 and y=0, what is its velocity and acceleration respectively? 2. Relevant equations I know that a position vector consists of r= R (cos theta i + sin theta j), also velocity is the first derivative of the position vector and acceleration is the second derivative of the position vector. How do I take a derivative of position vectors i j k, or do i just leave them as they are? 3. The attempt at a solution Ive tried taking derivatives to arrive at an answer with the proper position vectors but can't seem to get it right.