Let $u=\frac{2 z+i}{z-k i}, z=x+i y$ and $k>0$. If the curve represented by $\operatorname{Re}(\mathrm{u})+\operatorname{Im}(\mathrm{u})=1$ intersects the y axis at the point $P$ and $Q$ where $P Q=5$, then the value of K is :
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