Rant: Shitty fucking dangerous drivers

[ideologue08]

Eh, once again, the comparison was with a sturdy wall, not a car travelling at 10. If you're trying to argue against the physics, you won't win. You're thinking about momentum whereas the discussion is about velocity.

On the other hand, this case in particular had a car going against a bike.
A car weighs about 1000kg... a bike, a mere 200kg.
If the speeds were comparable, we still have a net momentum in the direction of the car.... of about 4/5 of the car's speed.

But the phrase the OP used is still false, there's no "combined" velocity of 100, you can't add velocities like that, adding together the initial velocities will not get you the final velocity (and yes, it is in the direction of the car as you kindly pointed out).