Consider two scenarios:
- Two identical vehicles (same size and mass) travel at the same speed, let's say 50 km/h, in opposite directions, and they collide with each other head-on.
- One of those vehicles hits a rock wall (which doesn't break nor budge in any significant way) head-on at 50 km/h.
From the point of view of one of the vehicles, which collision is more severe?
The answer may surprise you. Click the link above to read the article.