A rock is thrown downward into a well that is 8.76 m deep. If the splash is heard 1.02 seconds later, what was the initial speed of the rock?

Physics for Scientists and Engineers, Technology Update (No access codes included)
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Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter2: Motion In One Dimension
Section: Chapter Questions
Problem 2.85CP: A man drops a rock into a well, (a) The man hears the sound of the splash 2.40 s after he releases...
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A rock is thrown downward into a well that is 8.76 m deep. If the splash is heard 1.02 seconds later, what was the initial speed of the rock?

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