Answer :
The normal force has done no work on the box (Wn).
What is a scientific force?
The term "force" has a precise definition in science. At this level, it makes perfect sense to refer to a force as either a push or a pull. An object does not contain a force or "have it in it. "Another object exerts a force on the first. The concept of a force applies to both living and inanimate objects.
Which two kinds of forces are there?
There are primarily two categories that can be used to classify forces: Contact Powers. Forces without contact.
Learn more about force here:
https://brainly.com/question/12970081
#SPJ4