A man lies on his back and raises his head up off the floor. When doing so, the total tension force in his neck muscles is 54.5 N. The same man now is sliding feet first down a water slide. The slide makes a circular curve, where the outside wall of the slide is vertical but the curve itself is in the horizontal plane, and the radius of the curve is 2.40 m. While sliding along this curve, the man's speed is 4.00 m/s. The man raises his head from the wall of the slide and holds it steady, looking forward. At this moment, what is the total tension (in N) in the man's neck muscles