Explain the principle involve in the collision of car?

Answer 1

Newton's Law.

1. First law: When viewed in an intertial reference frane, an object either is at rest or moves at a constant velocity , unless acted upon by an external froce .
2. Second law: The acceleration of a body is directly proportional to, and in the same direction as, the net force acting on the body, and inversely proportional to its mass.
3. Third law: When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction to that of the first body.