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If you drop a stone into a well that is 118.5 m deep how soon after you drop the stone will you hear it hit the bottom of the well?
About 5.26 seconds. (almost 4.92 seconds to hit, 0.35 sec for the sound to return)
You need to find how long it takes for the stone to drop to the water and make
an audible 'sploosh', and then find how long it takes for the sound to reach you
from the depths. The acceleration g is about 9.8 m/sec2.
Time to sploosh:
x = 1/2 g T2
118.5 = 4.9 T2
T = sqrt(118.5/4.9) seconds
Time for the sound to return to the top: (Use 340 meters per second)
118.5/340 seconds
Total time between the drop and hearing the sploosh:
sqrt(118.5/4.9) + (118.5/340 ) = 5.26 seconds(rounded)
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