Friction is the force that opposes motion between surfaces in contact. Some of the kinetic energy of the block is lost in order to overcome friction.
What is kinetic friction?
The term kinetic friction has to do with the opposition offered to a moving object by the surface on which it moves. We must note that the most prominent factor that affects friction is the nature of the surfaces in contact.
Since the question is incomplete, we can not calculate the kinetic energy. However, we must note that in the motion of the block, some of the kinetic energy is lost in order to overcome friction.
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