A car initially traveling eastward turns north by traveling in a circular path at uniform speed as shown in Figure P6.6. The length of the arc ABC is l = m, and the car completes the turn in t = s.
(a) What is the acceleration when the car is at B located at an angle of th = ? Express your answer in terms of the unit vectors i ^ and j ^. Determine
(b) the car's average speed and
(c) its average acceleration during the 36.0-s interval.