Answer
$v=4.08m/s$
Work Step by Step
We know that
$T+\Sigma U_{1\rightarrow 2}=T_2$
$\implies 0+50=\frac{1}{2}mv^2$
$\implies 50=\frac{1}{2}(6)v^2$
This simplifies to:
$v=4.08m/s$
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