a car travels a certain distance along a straight road (in the +x direction). Th
ID: 1583674 • Letter: A
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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. GUSTAVO G MALDONADO (Student - section: 070) loncapa hep.upem 2017 L Messages Courses Help Course Contents» » chapter2-Traveling Car A car travels a certain distance along a straight road (in the +x direction). The distance the car travels as Timer Notes à Evaluate Feedback-Print 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. 1000 E 800 600 8 400 200 20 40 Time (s) 60 80 At 76 sec, the speed is as high as it gets. The speed is .. zero at 23 sec. an The acceleration magnitude at 15 sec is.. the acceleration magnitude at 38 sec. Equt o oreat Equal tThe x-acceleration is zero at 4 sec C tThe x-acceleration is .. zero at 58 sec. Grea harThe speed at 48 sec is .. the speed at 76 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. So Are Incorrect. Tries 11/12 Previous Tries Using the graph above, calculate the average speed of the car for the period from 0 to 60.0sExplanation / Answer
1) FALSE
At slope of x( t ) is higher around 50 seconds and thus it is FALSE that at 76 seconds the speed is as high as it gets.
2) EQUAL TO
The slope of x ( t ) is zero, thus the speed is ZERO at 20 seconds.
3) GREATER THAN
At 15 seconds, the car is decelerating with magnitude LARGER than its acceleration at 38 sec as can be seen because the curve changes more sharply (higher curvature) at 15 seconds than at 38 seconds.
4) EQUAL TO
Since the slope of the curve x( t ) is constant around 4 seconds, the velocity is constant and thus acceleration vanishes at that time.
5) LESS THAN
At 58 seconds, the position has a decreasing slope, which means the velocity is decreasing, corresponding to a negative acceleration.
6) GREATER THAN
Judging by the slopes, at 48 seconds the speed is MORE than at 76 seconds.
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