# math physcis.docx - 32 A car is able to stop in a distance...

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32) A car is able to stop in a distance d. Assuming the same braking force, what distance does this car require to stop when it is traveling twice as fast? A) √2 dB) dC) 2√2 dD) 4 dE) 2 d 38) A motorist travels for 3.0 h at 80 km/h and 4.0 h at 60 km/h. What is her average speed for the trip? and the average speed is the total distance divided by the totaltime, thus: 3hr*80km/hr + 4hr*60km/hr = 480km total time is 7 hrs, thus: average speed = 480km / 7hrs =68.57 km/hr =69 km/hr (to two sig figs) 39) A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What is the average speed of the motorist for this trip? km/h FIGURE 2-7 40) Refer to Fig. 2-7. If you start from the Bakery, travel to the Cafe, and then to the Art Gallery, what is the distanceyou have traveled? km

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