Need finding charge 2 in this gravitational force practice

okay i have so many questions. but the big one here is: um wt..f is this mess? ?

the answer would be a

force is mass*acceleration.

we have a very small mass: 11.4*0.001 kg

if we want 0.035n of force, we need an acceleration:

0.035 = 11.4*0.001*a

a = 0.035/(11.4*0.001) m/s^2