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 speed at 10 sec is.....the speed at 79 sec. The x-acceleration is.....zero at 15 sec. v The speed is.....zero at 20 sec. The x-acceleration is.....zero at 4 sec. At 46 sec, the speed is as high as it gets. The acceleration magnitude at 15 sec is.....the acceleration magnitude at 38 sec.

Explanation / Answer

1) greater than (v = dx/dt = slope which is greater at 10 sec rather than 79sec)

2) equal to (slope is constant so speed constant a= 0)

3) equal to (slope= 0)

4) equal to (same as 2nd part)

5) true (maximum slope in this interval)

6) less than

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