3. The graph at right shows the position of a car along a straight road (defined

Question

3. The graph at right shows the position of a car along a straight road (defined by the x-axis, with "forward" in the +x- direction) over the span of 0 to 12s Express all of your final answers below to 2 significant figures: a. By inspection of the graph, during which of the following times or time intervals is the car at rest? 10 B. momentarily at C. both A& B 1.3 s b. By inspection of the graph, during which of the following times or time intervals is the car moving backward? A. 0 to 13s B. r 3 to 6 s C. I-810 12 s D. both B& C E. all of the above c. Find the car's average velocity and average speed over the entire 12-second time interval: d. Find the average speed and average velocity over the time interval car's 0 to 3 s: e. Find the car's average speed and average velocity over the time interval 3 to 6 s:

Explanation / Answer

(a) Answer A

(b) Answer D

(C) Avg. Velocity = Total Displacement / Total time = (1 - (-4)) / 12 = 0.417 m/s

Avg. Speed = Total Distance / Total time = ((5+4) + (5-2) + (2-1) )/ 12 = 1.08 m/s

(d) avg. speed = avg. velocity = ( 5- (-4) )/ 3 = 3 m/s

(e) Avg. speed = (5-2)/ 3 = 1 m/s

Avg. velocity = (2-5)/3 = -1 m/s

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