I have the following question
To find the acceleration I rearrange the formula F = ma to get a = F / m.
This gives a = 5 / 2.5 = 2.
However, the solutions say that the answer should be the following:
However, I am not sure how this answer is achieved.
It seems a bit weird to see it drawn this way, but I think what the drawing is intended to represent is that there are two forces, each of $5$ N, acting on the body. Each force is represented by its own arrow, and that's why there are two arrows.
The arrows appear to be parallel, so I think we're supposed to conclude that the two forces are in the same direction. Two forces of $5$ N each in the exact same direction, applied to the same body, gives a total force of how much on that body?