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ch02-p001

# ch02-p001 - 1(a The average velocity during any time...

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1 (a) The average velocity during any time interval is the displacement during that interval divided by the duration of the interval: v avg = x/ t , where x is the displacement and t is the time interval. In this case the interval is divided into two parts. During the first part the displacement is x 1 = 40 km and the time interval is t 1 = (40 km) (30 km / h) =1 . 33 h . During the second part the displacement is x 2 = 40 km and the time interval is t 2 = (40 km) (60 km / h) =0 . 67 h . Both displacements are in the same direction, so the total displacement is x = x 1 + x 2 = 40 km + 40 km = 80 km. The total time interval is t = t 1 + t 2 . 33 h + 0 . 67 h = 2 . 00 h. The average velocity is v avg = (80 km) (2 . 0h) =40km / h . (b) The average speed is the total distance traveled divided by the time. In this case the total
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