1. The problem statement, all variables and given/known data Here is a picture of the situation http://i48.tinypic.com/vnmi5t.jpg 2. Relevant equations polar coordinate system 3. The attempt at a solution ok so first i'm attempting to find velocity as a function of time, first I know V=(dR/dt)er +(R)(d∅/dt)e∅ - this is a vector so, R = 20+15cos(∅) and d∅/dt = ∏ and dR/dt = -15sin(∅) now this is wher ei get stuck. so I'm trying to get velocity as a function of time, the only thing i can think of to get there is my finding the magnitude of the vector, so I get, ((-15sin(∅))^(2)+(20∏ +125cos(∅))^(2))^(1/2) simplifying i get 1 + (8/3)∏cos(∅) + (16/9)∏^(2) = V(∅) but i want v as a function of time not theta, and i have no idea to go about getting there. Any help would be greatly appreciated thanks!