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 5.59 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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  1. (1/2) m v^2 = m g h
    (1/2) m u^2 = 2 m g h
    u/v = sqrt 2
    5.59 * 1.414

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