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A pebble is dropped freely in a well fro...

A pebble is dropped freely in a well from its top. It takes 20 s for the pebble to reach the water surface in the well. Taking `g = "10 m s"^(-2)` and speed of sound = `330 "m s"^(-1)`. Find the time when sound is heard after the pebble is dropped.

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To solve the problem step by step, we will break it down into two main parts: calculating the depth of the well and then finding the time taken for the sound to travel back to the top of the well after the pebble hits the water. ### Step 1: Calculate the depth of the well We will use the equation of motion for the pebble dropped from rest: \[ s = ut + \frac{1}{2}gt^2 \] Where: ...
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