A gymnast having a mass of 80 kg holds the two rings with his arms down in the position show as he swings downward. His center of mass is located at point G1. When he is at the lowest position of his swing, his velocity is (Vg)1 = 5 m/s. At this position he suddenly lets his arms come up, shifting his center of mass to position G2. Determine his new velocity in the upswing and the angle to which he swings before momentarily coming to rest. Treat his body as a particle.