2-12.  A test vehicle is being developed that can react almost instantaneously to objects in its path. Its position x during one trial is graphed against clock reading t in Figure 2-23. What is the vehicle's average

a.   velocity between t = 4 s and t = 6 s? b.   velocity between t = 6 s and t = 8 s? c.   velocity between t = 4 s and t = 8 s? d.   speed for the interval in a? e.   speed for the interval in b? f.   speed for the interval in c? g.   velocity between t = 0 and t = 10 s? h.   speed during this interval?

Figure 2-23  Problem 2-12

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