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 choices are true, false, greater than, less than, or equal to

Part I

1. The speed at 76 sec is ..... the speed at 4 sec.

2.The x-acceleration is ..... zero at 73 sec .

3.The speed is ..... zero at 23 sec.

4.At 4 sec, the speed is as high as it gets. ?

5.The acceleration magnitude at 15 sec is ..... the acceleration magnitude at 36 sec. ?

6.The x-acceleration is ..... zero at 15 sec.

Part II

Using the graph above, calculate the average speed of the car for the period from 0 to 40.0 s

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 choices are true, false, greater than, less than, or equal to The speed at 76 sec is ..... the speed at 4 sec. The x-acceleration is ..... zero at 73 sec . The speed is ..... zero at 23 sec. At 4 sec, the speed is as high as it gets. ? The acceleration magnitude at 15 sec is ..... the acceleration magnitude at 36 sec. ? The x-acceleration is ..... zero at 15 sec. Using the graph above, calculate the average speed of the car for the period from 0 to 40.0 s

Explanation / Answer

1)less than ( because at 76s slope is less)
2) equal (because v is constant)
3) equal (because v is constant)
4) false (because slope(v) is maximum in between 40s to 60s)
5) less than (at 15s curvature is less than vurvature at 36s)
6) less than ( accleration is negative)
part2
Vav = distance/time = 400/40 = 10 m/s

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