74 0 0 Two horses pull a large crate at constant speed across a barn floor by means of two light steel cables. A large box of mass 250 kg sits on the crate (Figure 6-40). As the horses pull, the cables are parallel to the horizontal floor. The coefficient of friction be- tween the crate and the barn oor is 0.25. (a) What is the work done by each horse if the box is moved a distance of 25 m? (b) What is the tension in each cable if the angle between each cable and the direc- tion the crate moves is 15