Answer
The answer is below.
Work Step by Step
Using conservation of energy, we find:
$\frac{1}{2}(\frac{mv}{m+M})^2 = gh \\ (\frac{mv}{m+M})^2 = 2gh \\ (\frac{mv}{m+M}) = \sqrt{2gh} \\ v = (\frac{m+M}{m})\sqrt{2gh} $
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