Please help me, this school work is not the easiest for me.

Look at my explanation pls :)

Explanation:

First box (left): 5
First box (right): N (newtons)

Second box (left): 0.05
Second box (right): kg

Third box (left): 100m/s^2
Third box (right): m/s^2 (metres per second squared/cubed)

How I solved for acceleration:
F = ma (force = mass x acceleration)
5N = (0.05)(a)
5N = 0.05a
100m/s^2 = a

Hope this helps!