Warning: This was a fun question for some, not for others. And now I know, I should have posted it in the physics forum :-)
At the end of Daredevil (the tv-series) S02E07 "Semper Fidelis", our hero "borrows" a flashlight from Elektra and drops it in the seemingly bottomless pit. I try my luck over here:
I counted 19.8 seconds before the cut to the end titles. The next episode begins and red estimates
Daredevil: "It's gotta be 40 stories, at least."
As a real geek, that got me thinking and I tried to estimate the minimum depth of the hole.
As it turns out, the whole calculation seems trivial, if completely ignoring the fact, that they breathe air. Somewhere around 2km, I guess. Waaay more than 40 stories.
On the other hand (assuming that the super-power of not needing air to breathe is not a hidden plot device), the actual calculation with air resistance, based on the time given to impact, is quite untrivial. There are all kinds of factors involved and from air temperature to object mass, nearly everything matters (physically) and the maths behind it involves evil things like integration.
Enough said. Show me what you got, My humble calculations gave a minimum depth of
close to 500 meters.
That would make 12.5 meters per story. So we are talking cathedral here.
My question to you is:
How would you come up with a minimum depth?
I will share the whole process about getting to the 500m gladly, but this question is more about how you would approach this riddle, so I would consider it a meta-spoiler. And maybe you can save the character of Daredevil from becoming a math-genius too, which would IMHO totally save the day.
Clarification: This question is not about a potential plothole, or the writing or the totally awesome ninja fighting in front of a huge whole. Consider it recreational TV-math... or something ;-)