Rant: Shitty fucking dangerous drivers

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Eh, once again, the comparison was with a sturdy wall, not a car travelling at 10.

Once again, the actual case at hand involves two vehicles.

If you're trying to argue against the physics, you won't win. You're thinking about momentum whereas the discussion is about velocity.

I'm thinking of energy, as I said. In this case kinetic energy, which is proportional to square of velocity. I agree with FtR's statement that you can't simply add velocities. A crash between two vehicles going 30 would have different results from the same two vehicles crashing at 10 and 50, even though both cases sum to 60.

However, his comparison to the brick wall is faulty.

It isn't faulty no, I can guarantee that. But in any case, whatever the speed was, somebody died from it, and I'm pretty sure they're not thinking about what speed they were travelling at when they died. I think the overriding lesson to be learnt here is that we will all die someday and all our bickering about velocity and energy will be totally meaningless and irrelevant (except for the 15yr old physics geek accessing this forum on the planet Mars 250 years from now).