Chapter 4, Problem 98P

A particle is in uniform circular motion about the origin of an xy coordinate system, moving clockwise with a period of 7.00 s. At one instant, its position vector (measured from the origin) is $\stackrel{\to }{r}=(2.00\text{m) <mover accent="true"> i <mo> ^ </mo> </mover> }-\text{ (3}\text{.00 m) <mover accent="true"> j <mo> ^ </mo> </mover>}$. At that instant, what is its velocity in unit-vector notation?