figure time
time=73.3m/1.22m/s+73.2/2.80=86.2sec
avgvelocity=distance/time=146.4/86.2=1.70m/s
compute the average velocity in the following two cases: you walk 73.2m at a speed of 1.22m/s and then run 73.2m at a speed of 2.80m/s
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