I know the acceleration due to gravity (ie 9.8 m/s2) will have a negative sign when falling down, a positive one when going up. My question is, will the acceleration due to gravity always have a positive sign when the object is moving faster, and will the acceleration due to gravity always have a negative sign when an object slows down

Yes

Explanation:

Accerelation is measured by change in velocity. So naturally, if an object is slowing down, its velocity is decreasing so acceleration is negative. If it is speeding up velocity is increasing so positive acceleration.

(Velocity final - Velocity initial)/t

Note that this does not apply only to gravity, but to all linear accelerations

he . if i may ask what i your question exactly?

explanation:

the answer would most likely be c, because if it's a comical piece of information, it may likely not be true, if it's a site that allows anybody to edit the content, it could mean a five year old is typing the info, and if it's a tv show produced by a celeb, it may have a biased opinion.