A car travels a certain distance along a straight road (in the +x direction). Th
ID: 2000130 • Letter: A
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 x-acceleration is .... zero at 79 sec (less than, greater than, equal to)
The x-acceleration is ... zero at 38 sec (less than, greater than, equal to)
At 52 sec, the speed is as high as it gets (true, false)
The speed is .... zero at 20 sec (less than, greater than, equal to)
The speed at 52 sec is.... the speed at 67 sec (less than, greater than, equal to)
Using the graph above, calculate the average speed of the car for the period from 0 to 30.0s
1000 800 O 600 400 200 0 20 40 60 80 Time (s)Explanation / Answer
The x-acceleration is less than zero at 79 sec
The x-acceleration is .greater than zero at 38 sec
At 52 sec, the speed is as high as it gets -false
The speed is .equals to zero at 20 sec
The speed at 52 sec is greater than the speed at 67 sec
the acceleration magnitude at 15 sec is less than the acceleration magnitude at 38 sec
Explanation: The velocity is slope of the graph, and the acceleration is non-zero when the slope changes.
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