Answer :
We can see that the collision of the objects is an elastic collision.
What is the kind of collision?
Let us note that a collision could be elastic or in elastic. We can say that a Collison could be judged or said or designated to be an elastic collision when the kinetic energy and the momentum of the system that is undergoing the collision is conserved.
Let us recall that the principle of the conservation of the linear momentum states that the momentum before collision is equal to the total momentum after Collison. In other words, the momentum of the system does not change. Hence, the momentum of one of the objects must be transferred to the other object when they collide in a closed system
With that said, we can see that the two bocks move in opposite directions thus it is an elastic collision as we can see from the description in this answer.
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