Head on.
An elastic collision conserves kinetic energy. In this type of collision, the total kinetic energy before the collision is equal to the total kinetic energy after the collision.
Side impact collision
It is impossible to determine what type of geological formation this collision would create based only on your question's information. We do not know to which collision you are referring.
Head-On
A fatal one, of course.
An elastic collision is a type of collision in which there is no net loss in kinetic energy. In an elastic collision, both momentum and kinetic energy are conserved. This means that the total kinetic energy of the system before the collision is equal to the total kinetic energy after the collision.
A rear end collision will cause your head to press against the headrest. You might also be pressed forward during this type of collision, but the first movement is against the headrest.
collision
fender bender
D is worse.
In an elastic collision, the kinetic energy of the system remains unchanged. This means that the total kinetic energy before the collision is equal to the total kinetic energy after the collision.
A head-on collision is often considered the worst type of collision to be in. These types of collisions typically result in severe injuries or fatalities due to the forces involved when two vehicles collide directly with each other.