1. The problem statement, all variables and given/known data You are running at 4.5 m/s around a circle 12m in diameter. Is the centripital acceleration perceptible? 2. Relevant equations a=v^2/r 3. The attempt at a solution I know that the centripital acceleration is 1.7m/s^2 (4.5^2/12). What I don't know is what it means for centripital acceleration to be perceptible. Can anyone help me/ explain what this means?