If two automobiles collide, they usually do not stick together. does
this mean the collision is elastic? explain why a head-oncollision
is likely to be more dangerous than other types ofcollisions.

Explanation:

We know that if

e = 1  then collision is called perfectly elastic collision.

0<e <1  then collision is called partial elastic collision.

e =0  then collision is called inelastic collision.

So when two automobile collide then they usually do not stick together then this collision is called as elastic collision.

When object collide head to head it become more dangerous than other type of collision because when object come toward each other and due to suddenly velocity of object become zero due to this it produce large amount of force.Usually this force produce two time more as compare to when object moving in same direction.

explanation:

as the height from which the ruler was dropped increased, the speed of the ruler at ryan's hand increased.