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**Unformatted text preview: **is not to make the student go to an Atlas to look it up); the student can just as easily arbitrarily set T instead of D , as will be clear in the following discussion. In the interest of saving space, we brieﬂy describe the graph (with kilometers-per-hour understood for the slopes): two contiguous line segments, the Frst having a slope of 55 and connecting the origin to ( t 1 , x 1 ) = ( T/ 2 , 55 T/ 2) and the second having a slope of 90 and connecting ( t 1 , x 1 ) to ( T, D ) where D = (55 + 90) T/ 2. The average velocity, from the graphical point of view, is the slope of a line drawn from the origin to ( T, D )....

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