The kinetic energy of the crash is used up crushing the metal of the vehicle.
Kinetic energy is the energy that enables motion of an object, and is given by 1/2mv², where m is the mass and v is the velocity of the body in motion.
According to Newton's first Law of motion, a body will remain in a state of rest or constant motion unless acted upon by an external force. Therefore, a force will be required to change the speed or direction of a body in motion.
The kinetic energy of the crushing used up crushing the metal of the vehicle.
