(d) Suppose that to pump the gasoline, pay for it, and walk back to the truck takes you another 45 min. What is your average speed from the beginning of your drive to your return to the truck with the gasoline ?
KEY IDEA
Your average speed is the ratio of the total distance you move to the total time interval you take to make that move.
Calculation : The total distance is 8.4 km +2.0km+2.0km=12.4km. The total time interval is 0.12h+0.50h+0.75h=1.37h. Thus, Eq. 2-3 gives us
Savg=12.4km1.37h=9.1km/h.
Figure 2-5 The lines marked " Driving " and " Walking" are the position-time plots for the driving and walking stages. ( The plot for the walking stage assumes a constant rate of walking.)
The slope of the sraight line joining the origin and the point labelled "Station" is the average velocity for the trip, from the beginning to the station.
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