Starting from rest at the top, a child slides down the water slide at a swimming pool and enters the water at a final speed of 4.96 m/s.?

Starting from rest at the top, a child slides down the water slide at a swimming pool and enters the water at a final speed of 4.96 m/s. At what final speed would the child enter the water if the water slide were twice as high? Ignore friction and resistance from the air and the water lubricating the slide.
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