An overhead view of part of a pinball game is shown. If the plunger imparts an initial speed of 2.1 m/s to the ball at time t - 0, determine the acceleration a of the ball (a) at time t - 0.12 s and (b) at time t - 0.41 s. At point , the speed of the pinball has decreased by 18% from the initial value, and this decrease may be assumed to occur uniformly over the total distance traveled by the pinball. Use the values r - 185 mm and 8 - 61. E - -x D . C A B Answers: (a)t - 0.125, a- i+ j) m/$2 (b) t - 0.41s, a- i i+ i j) m/s2