EDIT: Tangential acceleration 1. The problem statement, all variables and given/known data If a car drives around a race track constructed such that two arcs of radius A=80m and Radius B=40m are joined by two stretches of straight track at a constant speed of 50 m/s, what is the ratio of the tangential accelerations A to B....Meaning asking for the ratio of the Tangential Acceleration around arc of radius A (80m) to that of the Tangential Acceleration around arc of radius B (40m). Also it is multiple choice. a.)1/2...b.)1/4...c.)2...d.)4......or e.)both equal 0. 2. Relevant equations 3. The attempt at a solution I know this is much easier than I am making it. I know that A_t=r*alpha....but I do not have alpha and I am a little confused to how to calculate it? Just a hint to get me going?