Question: Two particles ( a and b ) are moving in opposite directions around a circle with an angular velocity of ω. At the instant )=(0, they are both at the top of the circle. Find the velocity of a relative to b.  is the radius of the circle)

Two particles $($a and $b)$are moving in opposite directions around a circle with an angular velocity of $\omega .$At the instant $)=(0,$they are both at the top of the circle. Find the velocity of a relative to $b.$ is the radius of the circle$)$