This is letter C or 26 meters. Can you actually calculate the height of the place based on just dropping a stone? According to physics, this is possible. To do this, you would need a stopwatch so that you will be able to time when the stone hits the water.
Once you have all the right details, this formula can be used: Distance = 1/2 9.8 T^2. Take note that knowing the depth of the water can also be possible if this formula is used. Based on this, it will be safe to conclude the answer to this question is C. Some say that this formula is one of the easiest ways to know the distance in emergency situations.
The answer for this is C. 26 meters. It is always possible to measure the height of a certain spot from a body of water by throwing a stone but this is not ideal if you are going to do it on a deep well because you will not be able to see the bottom of the well. Take note that the initial velocity is always zero but the stone will pick up speed before it reaches the body of water.
Take note of the time that it took to reach the water and the height can be computed easily. To have a more accurate measurement, you can use a stopwatch. You can also use your normal watch if you do not have a stopwatch but you cannot be sure if everything would be accurate.