Velocity in 1D Motion

Q. A particle moves with a uniform speed $v$ in a circle of radius $R$.


The $x-$component of the average velocity of the particle in a half revolution will be (at final position as shown in figure)

1. $\frac{-v}{\pi }$
2. $\frac{-v}{2\pi }$
3. $\frac{-v}{4\pi }$
4. $\frac{-2v}{\pi }$