A weight is tied to a rope that is wrapped around a pulley as seen in the diagram above. The pulley is initially rotating in a counterclockwise (out of the page vector direction) fashion so that the weight is initially moving vertically upwards. The weight is providing the only torque on the pulley seen in the diagram. The weight slows down while rising, stops momentarily, and then moves back down. Which of the graphs below shows the angular acceleration of the pulley (a) versus time from the instant shown in the diagram above to when the weight comes back down to the same initial position? Assume the positive vector direction is out of the page. a (a) (b) (c) (d) a 000 m