system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is jumping off of a bridge like the Golden Gate fatal ?
gpt
At high-impact speeds, water is a bit like concrete. Imagine that a lake is made of millions and millions of tiny balls. Each of those balls needs time to move and absorb the impact when something hits it. But at fast enough speeds (like jumping from the top of a tall bridge), it simply doesn't have time to do that, and so the effect is like hitting a hard surface.