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2-8 Graphical Analysis 55. (II) Figure 2-42 shows the velocity of a train as a function of time. (a) At what time was its velocity greatest? (b) During what periods, if any, was the velocity constant? (c) During what periods, if any, was the acceleration constant? (d) When was the magnitude of the acceleration greatest? 40 30 v (m/s) 20 0 10 20 30 40 50 60 70 80 90 100 110 120 t ( s )57. (II) The position of a rabbit along a straight tunnel as a function of time is plotted in Fig. 2-44. What is its instan- taneous velocity (a) at t = 10.0s and (b) at t = 30.0 s? What is its average velocity (c) between t = 0 and t = 5.0s, (d) between t = 25.0s and t = 30.0s, and (e) between t = 40.0s and t = 50.0 s? 20 (m) * 10 O 10 20 30 40 50 t (s)