The motion diagram shown in the figure represents a pendulum released from rest at an angle of 45 from the vertical. The dots in the motion diagram represent the positions of the pendulum's bob at eleven moments (labeled 0 through 10) in time; the black arrows between adjacent dots (moments) represent the average velocities. Equal time intervals separate the dots. Also given is a "compass rose" in which directions are identified by letters of the alphabet. Part A Acceleration of the bob at the fifth moment