Answer
$\frac{14}{15}\pi\,mm/s$
Work Step by Step
$r=28\,mm$
$\omega=\frac{\theta}{t}=\frac{2\pi\,rad}{60\,s}=\frac{\pi}{30}\,rad/s$
$v=r\omega= (28\,mm)(\frac{\pi}{30}rad/s)$
$=\frac{14}{15}\pi\,mm/s$
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