Physics question help please?

Posted on 2014-12-11 07:02:00 in Physics by CHRIS

I've spent probably an hour on this one question and I can't figure it out. A horizontal 20 newton force is applied to a 5 kilogram box to push it across a rough horizontal floor at a constant velocity of 3.0 meters per second to the the right. What is the coefficant of kinetic friction between the floor and box? Determine the magnitude of the force of friction acting on the box? For the coefficant my teacher says the answer is 0.41 or 0.4. And for the magnitude of the force of friction she said it is 20

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