Getting Force with distance, mass and time

[DaRafster]

Homework Statement

A 15 kg box is pushed with a constant horizontal force of 85 N along a level surface. If the box moves with a uniform velocity of 6.0 ms–1, how much net force is required to accelerate it uniformly to 12 ms–1 in 2.0 s?

Relevant Equations

netforce = ma

...more equations I'm just so confused on which one to use (like SUVAT equations)

I'm sorry but I can't even attempt this question since I'm pretty much clueless, I got the notes but I don't understand them.

 

[gneill]

Yah, no attempt is not going to work here. (forum rules ) -- see:
https://www.physicsforums.com/threads/homework-help-guidelines-for-students-and-helpers.686781/

Perhaps you should be looking into the friction that occurs while the box is being pushed with uniform velocity?