Water skiers often ride to one side of the center line of a boat, as shown in the figure . In this case, the ski boat is traveling at 15 {\rm m}/{\rm s} and the tension in the rope is 76 N.
If the boat does 3600 J of work on the skier in 53.6 m, what is the angle \theta between the tow rope and the center line of the boat?