1. The problem statement, all variables and given/known data A runner covers one lap of a circular track 40.0 in diameter in 63.2 . If she covered the first half-lap in 28.7 , what were her average velocity for that half-lap? 2. Relevant equations We use perimeter of a cirle = 2*3.14*20m to get 125.6 3. The attempt at a solution I know that if the runner runs around a full lap, he or she will be at 0 velocity. But at half a lap I tried 62.8/28.7 to get 2.188. Im sure that is the speed and not the answer. I know I am making a small mistake.