The block's kinetic energy remains unchanged because it is travelling at a constant pace.
Work is the change in kinetic energy, and since there has been no change, there has been no work done on the block.
What Is Work?
A force must be applied in order to produce work, and there must also be motion or displacement in the force's direction.
The amount of work performed by a force acting on an item is equal to the force's magnitude times the distance travelled in the force's direction.
What is the formula for work done?
The work W is equal to the force f multiplied by the distance d, or W = fd, to mathematically describe this idea.
The work done is given by W = fd cos if the force is applied at an angle of to the displacement.
Therefore, here, the total work will be the product of the frictional force and distance that is 7m.
To learn more about work refer : brainly.com/question/25573309
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