If you speed up from rest to 12m/s in 3 seconds, what is your acceleration?
a.) 4m
b.) 4m/s/s
c.) 36m
d.) 36m/s

b) 4m/s/s

This is because you divide the speed you reach, by the time it takes to get to that speed:

12m/s ÷ 3s = 4m/s/s

The units come from what you divide, meters per second ÷ seconds this can be written as m/s/s or ms-² 

i just did an experiment like this in my science class. also the answer is yes, it will get separated because they are two opposites meaning if they are opposite they can not attract.

hope this .!