How would you go about finding the force of this object?

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The discussion centers on calculating the work done by an applied force on a wrench sliding down a tilted shelf. The applied force of 1.6N acts opposite to the wrench's motion over a distance of 1.2m. The correct calculation for work is W = F × d × cos(θ), where θ is the angle between the force and displacement. Since the force opposes the motion, θ is 180 degrees, resulting in a work value of -1.92 J.

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A wrench slides off a tilted shelf, although if a force of 1.6N is applied opposite the wrench's motion the wrench will slide down the shelf with a constant velocity. If the shelf is 1.2m long, what is the work done by the applied force on the wrench?
This is what I did:
w=(1.6N)(1.2m)= and got 1.92 J
On the worksheet it said that I have to multiply it also by cos 180, but I'm not understanding where they got cos 180 from. Can someone please explain?
 
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The force is being applied in the opposite direction of the displacement for work. Therefore, you have to use 180 degrees instead of 0 degrees.
 

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