Answer
Sensory structures for sensing changes in movement are present in the maculae of the vestibule. There hair cells are embedded in a gel-like substance called the otolithic membrane. And tiny calcium carbonate crystals (otoliths) sit on top.
When the elevator first starts moving, the otoliths shift position, and the hairs of the hair cells bends, which sends signals to the brain that there is a change in movement relative to gravity. But after some time, the receptors become adjusted to constant motion, and the otoliths go back into their normal position. Now, when the elevator suddenly stops moving, the otoliths again shift position, which again signals a change in movement. This second signal might make us feel as if we are still moving even after we stop.
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