What is perfectlyinelastic collision?

Answer 1

I'm not sure what you mean by "stronger" A perfectly inelestic collision is an ideal event in which none of the kinetic energy of the colliding bodies id tranferred into them as vibrations of their own molecules, i.e. transformed into heat. In an elastic collision, which always happens in the real world, some, or even all, of the kinetic energy of the two objects will be transformed into heat vibrating their molecules. This means that in an inelastic cillision, the bodies final velocities will add up to less than the total velocities that had before the collision, In the ideal state of an inelastic collision though, the sum of their final velocities must equal the sum of their final velocities.

Answer 2

A collision where the total kinetic energy (mass times speed squared) is the same after the collision as it was before. An example is colliding billiard balls, while not perfectly elastic it is close.

The opposite, a perfectly inelastic collision, is when all the kinetic energy is lost, being transformed to some other kind of energy like deformation and heat. An example here is throwing soft putty at a wall so it sticks - here all the kinetic energy was lost in the collision.

Real-world collisions are somewhere between those two extremes, depending on how much kinetic energy is retained.

As a mnemonic, if it bounces it is elastic. If perfectly elastic, it would bounce back just as fast as it hit.
To be perfectly elastic, the object cannot deform in the collision, as this would inevitably lead to some energy loss through heat. This makes a collision between billiard balls - which deform very little - more elastic than one between rubber balls, which deform quite a bit.

Answer 3

when all the energy is converted from kinetic to non kinetic and the colliding particles stop moving

Answer 4

It is a collision with no change in the kinetic energy; but this is only a theoretical ideal.

Answer 5

perfectly elastic head on collision