The answer is paper. A piece of paper can fall from a tall building without being damaged because it is very light and drifts slowly through the air.
However, once paper is soaked in water, it quickly becomes weak, soggy, and can tear apart easily. That contrast is what makes the riddle work.
It is a simple word puzzle designed to make you think literally at first, then realize the answer depends on the object’s physical properties rather than whether it is alive.
