1. The problem statement, all variables and given/known data A person pulls a box (m=10 kg) horizontally with +2m/s2 acceleration by applying 45 N force. The displacement of the box is 8 meters from initial position. a) How much work is done by applied force? b) How much work is done by kinetic frictional force? 2. Relevant equations Wf = Fcosθs F=ma Wfk = -Fks ??? Fk = μN ??? 3. The attempt at a solution I solved for part a, which was 360J. I don't know how to solve for part b, which it seems like I would need the friction coefficient? I tried Wfk = -(10)(2)(8) = -160 J, but that is incorrect. How do I find Fk to solve for the work done by friction?