1. The problem statement, all variables and given/known data What is the acceleration (in m/s^2) of a 10 kg mass moving with speed 2 m/s in uniform circular motion about a circle of radius 2m? 2. Relevant equations F=ma a=v^2/r in uniform circular motion 3. The attempt at a solution Seems simple enough. To find the acceleration I simply squared the speed and divided by the radius. 2^2/2=2m/s^2. This was graded as incorrect. What am I doing wrong? Am I confusing speed and velocity? Please help!