A pendulum, made of a mass 5.5 kg, is tied to the end of a string of length 60 cm as shown in the figure to the right. This position is called the “equilibrium” or “relaxed” position of the pendulum. If pulled and released, the pendulum can swing freely from side to side. If it is pulled up to an angle of 30º as shown in the figure, then released, what speed does it have when it again swings through the “equilibrium” position?