Consider a pendulum ride at an amusement park. Its distance (in meters) from the center is defined as y = cos (2) where t is time in seconds. The acceleration of the pendulum ride at 1.28 seconds is O a) _ 4 81 COs ( 2.56 O b) 4 cos ( 2.56 9 O c) - 4 cos ( 2.56 9 O d) - 4 sin ( 2.56 9 Oe) None of the above