1. The problem statement, all variables and given/known data A car is moving along a 4km long circular track with constant tangential acceleration. If it starts from rest and it does 2km between 2s and 8s find the vector acceleration, the velocity vector and the displacement after 16s 2. Relevant equations 3. The attempt at a solution All right, I am not sure about this, but I gave it a shot. So, reading the problem e understand that the car did 2000meters in 6seconds. So I'd say that: [itex]x_f = 1/2 at^2[/itex] [itex]2000 = 1/2a(6)^2 \rightarrow 18a = 2000 \rightarrow a = 111m/s^2[/itex] Since I am a bit clueless, I think what I just did is calculating the value of the acceleration, but obviously not the vector. Now, uhm. As long as I understood to get the acceleration vector I need to sum up radial and tangential acceleration, but I am just stuck, could someone help me out?