Question

insert one comma to separate the coordinate adjectives.
typical golf caddie responsibilities include carrying clubs, cleaning balls,
calculating distances and scores, and even replacing the divots - pieces of
grass and dirt that have been cut loose by the swift forceful strikes of golf
clubs.

Explanation:

Coordinate adjectives are adjectives that modify the same noun and can be separated by a comma. Here, "swift" and "forceful" both modify "strikes".

Answer:

Typical golf caddie responsibilities include carrying clubs, cleaning balls, calculating distances and scores, and even replacing the divots — pieces of grass and dirt that have been cut loose by the swift, forceful strikes of golf clubs.