\frac{2 S}{u + v} = \frac{S}{u + ω} \Rightarrow v = u + 2 ω = 3, 4 m / s

${\frac{2S}{u+v} = \frac{S}{u+\omega} \quad\Rightarrow\quad v = u+2\omega = {3,4}\,\mathrm{m/s}}$