1. The problem statement, all variables and given/known data 2. Relevant equations Vθ = r x θdot Vr = rdot Accelθ = r ⋅ θdot^2 + 2(r dot)(theta dot) Accelr = r double dot - (r ⋅(θdot)^2) 3. The attempt at a solution I know that the answer is supposed to be But I'm not quite sure on how I'm supposed to get to an answer like that. I'm still relatively new to polar coordinates, but I was hoping someone could get me to start thinking in the right direction? I thought that my position would be R = bθ and if I took the derivative with respect to θ, I would get R_dot = b, which I think would be equal to π/2. I'm not quite sure that's right though. I'd really appreciate it if someone could help me out!