Answer
$$
v=12.5 \mathrm{m} / \mathrm{s}
$$
Work Step by Step
With $r=(1.20 \mathrm{m}) / 2=0.60 \mathrm{m},$ using $\mathrm{Eq} .10-18,$ we find the linear speed to be
$$
v=r \omega_{0}=(0.60 \mathrm{m})(20.9 \mathrm{rad} / \mathrm{s})=12.5 \mathrm{m} / \mathrm{s}
$$
