1. The problem statement, all variables and given/known data A bureau rests on a rough horizontal surface ([tex]\mu[/tex]s = 0.50, [tex]\mu[/tex]k = 0.40). A constant horizontal force, just sufficient to start the bureau in motion, is then applied. The acceleration of the bureau is: A. 0 B. 0.98 m/s2 C. 3.3 m/s2 D. 4.5 m/s2 E. 8.9 m/s2 3. The attempt at a solution The answer is B and I can't figure out why. I tried to use only [tex]\mu[/tex]s and set friction equal to ma. It gave me C. I can see where B comes from, kinetic friction is subtracted from static friction. Can someone explain why?