No, it is impossible to know because the laws of physics break down once matter passes beyond the black hole's event horizon. All the information contained in matter breaks down, and therefore can know nothing
Widely accepted theory says there is a singularity (which you can think of as a point) within the black hole where gravity becomes infinite. All the matter which falls into the black hole is compressed into this infinitely dense singularity.
Black holes emit hawking radiation, and over incredibly long time scales, maybe even longer than when all the heat and light passes out of the universe, the black hole loses energy via this radiation and will ultimately disappear. Nobody knows what will happen to all the matter that fell into it once the black hole disappears