Answer:
<em>The object traveled 4 cm by the end of eight seconds.</em> Correct: A)
Explanation:
<u>Speed vs Time Graph</u>
In a speed-time graph, speed is plotted on the vertical axis and time is plotted on the horizontal axis. If the graph is a horizontal line, the speed is constant, if the line is sloped up, the speed is increasing and the acceleration is positive and constant, and if the line is sloped down, the speed is decreasing and the acceleration is negative and constant.
The distance traveled by the object can be found by calculating the area under the graph and above the x-axis.
The graph provided shows two different zones: the first 4 seconds, the speed is constant at 1 cm/s, and the last 4 seconds, the speed is zero, i.e. the object is not moving.
The area behind the first zone is a rectangle of height 1 cm/s and base 4 sec, thus the distance is 1 * 4 = 4 centimeters.
The second zone corresponds to an object at rest, thus no distance is traveled.
The object traveled 4 cm by the end of eight seconds.
A) Correct. As shown above
B) The distance traveled is 4 cm. Incorrect
C) The distance traveled is 4 cm. Incorrect
D) The distance traveled is 4 cm. Incorrect
