A stone is dropped from the top of a tower 400 ft high into a lake. How many seconds will it take before the impact sound is heard at the top of the tower?
Answer: 5 seconds
Explanation
1. Stone dropped from 400 ft tower — Impact sound heard time:
-
What happens: Stone falls, hits water, sound travels back up.
-
Key points:
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Time to fall = g2h
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Time for sound to travel up =
-
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Total time: Around 5+0.36=5.36 seconds (approximate).
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