A river gradually deepens, from a depth of $4 \ m$ to a depth of $8\ m$ as shown. The width, $W$, of the river does not change. At the depth of $4 \ m$, the river's speed is $12\ m/sec.$ Its elocity at the $8\ m$ depth is ......... $m/sec$
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Using fluid continuity with $\mathrm{W}$ as river width.
$A_{1} v_{1}=A_{2} v_{2}$
$4(W)(12)=(8)(W) v_{2}$
$\mathrm{v}_{2}=6 \mathrm{m} / \mathrm{s}$
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