A worker drags a box of mass 50 kg that is initially at rest across a horizontal floor. The worker attaches a rope to the box and pulls on the rope so that the rope makes a constant angle of 36. 8o above the horizontal. The static and kinetic friction coefficients between the box and the floor are 0. 18 and 0. 10, respectively. It takes the worker 5. 12 seconds to move the box 10 m from rest.