Figure shows a body of mass m moving with a uniform speed $v$ along a circle of radius $r$. The change in velocity in going from $A$ to $B$ is
$v\sqrt 2 $
$v/\sqrt 2 $
$v$
zero
Figure shows a body of mass m moving with a uniform speed $v$ along a circle of radius $r$. The change in velocity in going from $A$ to $B$ is
$\left| {\overrightarrow {\Delta v} } \right| = 2v\sin (\theta /2) = 2v\sin \left( {\frac{{90}}{2}} \right) = 2v\sin 45$$ = v\sqrt 2 $