Answer
$11.2\frac{m}{s}$
Work Step by Step
As we know that
$u_{\circ}=(\frac{f-f^{\prime}}{f+f^{\prime}})v$
We plug in the known values to obtain:
$u_{\circ}=(\frac{205-192}{205+192})(343)$
$u_{\circ}=11.2\frac{m}{s}$
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