l T-Mobile LTE 29%) 11:01 AM loncapa1.hep.uprm.edu Traveling Car-2 Points:2 A ca

Question

l T-Mobile LTE 29%) 11:01 AM loncapa1.hep.uprm.edu Traveling Car-2 Points:2 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 uniformin. Select the appropriate choice for each statement. 1000 800 600 400 200 0 20 40 60 80 Time (s) At 70 sec, the speed is as False high as it gets Greater than The speed at 70 sec is the speed at 4 sec Greater thaThe speed is.. zero at 26 sec zero at 64 sec. zero at 15 sec The x-acceleration is.... Less than The x-acceleration is.... Less than Greater thanThe acceleration magnitude magnitude 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

Explanation / Answer

Note that the speed is the slop of the curve.

a) The speed is greatest from 0 to 15 sec. At 70 sec the speed is as high as it gets. False

b) The speed at 70 sec is less than the speed at 4 sec

c) The speed is equal to zero at 26 sec

d) The speed remains the same at 64 sec. Hence the x acceleration is equal to zero at 64 sec

e) The speed decreases at 15 sec. Hence the x acceleration is less than zero at 15 sec

f) The acceleration magnitude at 38 sec is equal to the acceleration magnitude at 15 sec.

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