I've attached a screen shot of the problem. It is from last year's Physics Final. I was pretty confused by the problem, it is stated that the coefficient of friction is μk. Therefore, I am definitely sure the system is accelerating. Maybe I described the problem incorrectly, I hope the picture...
A 2.0 kg block (m1) and a 6.0 kg block (m2) are connected by a massless string. Applied forces, F1 = 12.0 N and F2 = 5.0 N, act on the blocks, as shown in the figure below m1 is on the left side of the system, F1 is pulling on m1 to the left; m2 is to the right, F2 is is pulling m2 to the right...