A car travels a certain distance along a straight road in the +x direction). The

Question

A car travels a certain distance along a straight road in the +x direction). The distance the car travels as a unction of time is shown in the figure below. When the car changes speed it does so uniformly. Select the appropriate choicé for each statement. 1000 800 600 400 200 The speed at 52 sec is (true, false, equal, greater, less) the speed at 64 sec The speed is (true, false, equal, greater, less) zero at 29 sec. The acceleration magnitude at 15 sec is (true, false, equal, greater, less) the acceleration magnitude at 37 At 4 sec, the speed is as high as it gets.(true, false, equal, greater, less) The x-acceleration is (true, false, equal, greater, less) zero at 50 sec The x-acceleration is (true, false, equal, greater, less) zero at 37 sec. By extrapolating the straight sections of the graph, you can estimate the time during which the speed is changing. This, with the change in speed, should let you estimate the magnitude of the acceleration. Using the graph above, calculate the average speed of the car for the period from 0 to 60.0s

Explanation / Answer

1) greater

2) true

3) less than

4) False

5) False

6) False

7) Average speed = total distance travelled/total time taken

= 1000/60

= 16.7 m/s

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