SOLUTION: A rock is dropped into an abandoned mine and a splash is heard 9 s later. Assuming that it takes a negligible time for the sound to travel up the mine shaft, determine the depth of

Question 779503: A rock is dropped into an abandoned mine and a splash is heard 9 s later. Assuming that it takes a negligible time for the sound to travel up the mine shaft, determine the depth of the shaft and how fast the rock was falling when it hit the water.
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
A rock is dropped into an abandoned mine and a splash is heard 9 s later. Assuming that it takes a negligible time for the sound to travel up the mine shaft, determine the depth of the shaft and how fast the rock was falling when it hit the water.
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s = at^2/2 = 4.9t^2/2
s = 198.45 meters deep
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v = at = 9.8*9
v = 88.2 meters/sec at impact

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