An argument about the likely kinetic energy of the ball before and after the collision with the can is can remain the same, halved and completely transferred.
In physics, we understand as a collision process the interaction between two or more bodies, initially free (that is, there is no interaction between them). Collision is usually divided into three categories: elastic collision, partially elastic collision and inelastic collision.
Analyzing for each of these cases we have that the kinetic energy before and after the collision will be:
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