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

Question

A car travels a certain distance along a straight road (in the +x direction). The distance the car travels as a function of time is shown in the figure below. When the car changes speed it does so uniformly. Select the appropriate choice for each statement. The acceleration magnitude at 36 sec is ..... the acceleration magnitude at 15 sec. The speed at 73 sec is ..... the speed at 46 sec. At 7 sec, the speed is as high as it gets. The x-acceleration is ..... zero at 48 sec. The speed is ..... zero at 23 sec. The x-acceleration is ... zero at 15 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.

Explanation / Answer

1) less than

2) greater than

3) true

4) greater than (sharp peak)

5) equal to

6) greater than

5)

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