A pondering physics student paces forward and backward. His motion is shown on the following graph of horizontal position x vs. time t. Graph of x (in meters) vs. t (in seconds). The y-intercept is at (0,0), then x increases linearly from 0 m to 2 m over 4 s, stays constant at 2 m from 4 to 8 seconds, and then decreases linearly from 2m to 0 m between 8 s and 12 s. Graph of x (in meters) vs. t (in seconds). The y-intercept is at (0,0), then x increases linearly from 0 m to 2 m over 4 s, stays constant at 2 m from 4 to 8 seconds, and then decreases linearly from 2m to 0 m between 8 s and 12 s.
What is the average velocity of the student between the times t=0 and t=12 s? Choose 1
(Choice A) 12 m/s
(Choice B) 0 m/s
(Choice C) - 0.17 m/s
(Choice D) 0.17 m/s