Answer:
The magnitude of the work performed by the mover is 1863 J.
Step-by-step explanation:
The work can be found using the following equation:

Where:
F: is the force
d: is the displacement = 8.1 m
First, we need to find the net force in the horizontal direction, as follows:
a = 0 since the mover slides a refrigerator at a constant velocity.

: is the friction force.
Then, the work is:
Therefore, the magnitude of the work performed by the mover is 1863 J.
I hope it helps you!