Acceleration and friction force

[moomoocow]

hi!
if i were to push a carton, and the friction force was 200 Newtons..
how much force would i have to exert so the box is accelerating at 2m/s/s?
i don't know how to calculate it because the mass of the carton is not given..anysuggestions?

 

[verty]

Perhaps they want an algebraic answer. I would call the mass x and derive a formula.