A man stuck in a small sailboat on a perfectly calm lake throws a stone overboard. It sinks to the bottom of the lake.
When the water again settles to a perfect calm, is the water level in the lake higher, lower, or in the same place compared to where it was before the stone was cast in?
This problem is a classic. It's very tricky, but there's a clever way to use limits to find and understand the answer intuitively!
by Brilliant Staff
