Answer
$v_0 = \sqrt{2gh +\frac{R^2g}{8h} }$
Work Step by Step
We know from the values of the x and y components of velocity that:
$v_0 = \sqrt{2gh +\frac{R^2g^2}{8gh} }$
This simplifies to:
$v_0 = \sqrt{2gh +\frac{R^2g}{8h} }$
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