The total mechanical energy before the collision of the block system will remain the same to the total mechanical energy after the collision.
In the field of science, mechanical energy can be described as the kind of energy that is present at the time of motion or at the time of rest.
Hence when two block systems collide, the mechanical energy can change from one form to another but the total energy will remain the same.
This is because, according to Newton, energy can change form from one form to another but the total energy remains the same.
Hence, in the block system, the mechanical energy will remain the same after collision.
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