A Girl Runs Around a Circular Track of Radius R $\mathcal { V }$

Multiple Choice

A girl runs around a circular track of radius R with a constant speed v. At the moment the girl has run half of the track, the magnitude of her average velocity is

A) $\mathcal { V }$
B) $0$
C) 2v/. $\pi$
D) $2 v$
E) 2v. $\pi$