Figure 8-32 shows a thin rod, of length L = 1.3 m and negligible mass, that can pivot about one end to rotate in a vertical circle.

Figure 8-32 shows a thin rod, of length L = 1.3 m and negligible mass, that can pivot about one end to rotate in a vertical circle. A heavy ball of mass m = 13 kg is attached to the other end. The rod is pulled aside to angle θ0 = 19° and released with initial velocity 0 = 0. What is the speed of the ball at the lowest point?