A pendulum, consisting of a ball of mass m = 0.5 kg attached to the end of a massless cord of length l = 0.75 m, can swing vertically about the upper end which is fixed. The ball is pulled aside to an angle of θ0 = 30? from the vertical and released from rest.
(a) What is the speed of the ball at the lowest point?
(b) Does this speed increase, decrease, or remain the same if the angle θ0 is increased?