Question

Make a the subject of F=ma
a) a = F/m
b) a = m/F
c) a = Fm

Answer 1

m and a have been multiplied together so we need to do the opposite to get a alone. Which is divide by m.
But you have to do the same on both sides so now F also has to be divided by m.

Thus that produces the equation a = F/m

Which is option A.