# Given a graph with a position vector and a vector with velocity, defining another vector. No idea where to start.

Diagram for question, click for image

Hi Please see image link for the question (because there is a diagram) I have no idea to where even start with this! All help appreciated, thanks

Hints: $$r(0) = b$$. Figure out the radius of the circle of rotation, and use that to determine a parametric formula for $$r$$ in terms of $$\cos t$$ and $$\sin t$$ ($$t$$ is time). Note that $$\omega$$ is a constant vector in the same direction as $$a$$.