How fast are the pebbles going when they hit her window

Physics for Scientists and Engineers, Technology Update (No access codes included)
9th Edition
ISBN:9781305116399
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter3: Vectors
Section: Chapter Questions
Problem 3.62AP: After a ball rolls off the edge of a horizontal table at time t = 0, its velocity as a function of...
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Romeo is throwing pebbles gently up to Juliet's window, and he wants the pebbles to hit the window with only a horizontal component of velocity. He is standing at the edge of a rose garden hhh = 7.5 mm below her window and LLL = 7.7 mm from the base of the wall (Figure 1).

 

How fast are the pebbles going when they hit her window?
Express your answer to two significant figures and include the appropriate units.
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