From a purely physics point of view, hitting an immovable object is the equivalent of hitting an object of the same mass and speed from the opposite direction.
That is why I am critical of ANCAP tests, a five star Ford Fiesta hits the wall at 60kmh - is the equivalent of hitting another Ford Fiesta travelling at 60kmh from the opposite direction. But my question is how many cars on the road weigh the same as the Fiesta? In reality the Fiesta would collide with a lot more heavier cars on the road which throws the test out in real world conditions.
That is why ALL THINGS BEING EQUAL a five star heavier car (like a Falcon) is probably safer in real world conditions than a light 5 star car.
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