Answer
$y^{2}\sqrt y$
Work Step by Step
$\sqrt (y^{5})=\sqrt (y^{4}\times y)=\sqrt (y^{4})\times\sqrt y=y^{2}\sqrt y$
We know that $\sqrt (y^{4})=y^{2}$, because $(y^{2})^{2}=y^{2\times2}=y^{4}$.
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