2. The graph describes the motion of an object moving in a straight line. At the beginning it is going east. From the graph, determine the following. a)The object’s displacement in the first 3.0s. b)The object’s displacement between t=3.0s and t=5.0s. c)The total displacement of the object in 14s. d)The average velocity of the object from t=0s to t=8.0s e)The d-t graph use it to check your answers to parts a) to d). Question 1, Page 59 – Fundamentals of Physics: A combined edition

3. Velocities

4. Accelerations

6. Displacements

14. Putting it all together Velocity is constant at 80 m/s means no (0) acceleration and the displacement/time graph should be a straight sloped line. Velocity is decreasing from 80m/s to 0m/s for an acceleration of - 80m/s 2 in the acceleration vs time graph at the top. In the displacement/time graph we see a curved line that goes from a slope of 80m/s to a slope of 0m/s. The object is stationary (doesn’t move) so there is no change in velocity and no acceleration as well. The velocity of the object increases from 0m/s to -40m/s. This is an acceleration of - 13m/s 2. The displacement is curved from a slope of 0m/s to - 40m/s. The velocity remains constant at -40m/s. This means there is no acceleration and the displacement graph is a straight, sloped line because of constant velocity. The velocity is increasing as the object puts on the brakes from -40m/s to 0m/s. Since the object is in reverse the breaking action provides a positive acceleration. The slope of the displacement curve starts with a value of -40m/s and curves to 0m/s.

15. The graph describes the motion of an object moving in a straight line. At the beginning it is going east. From the graph, determine the following. a)The object’s displacement in the first 3.0s. b)The object’s displacement between t=3.0s and t=5.0s. c)The total displacement of the object in 14s. d)The average velocity of the object from t=0s to t=8.0s e)The d-t graph use it to check your answers to parts a) to d). Question 1, Page 59 – Fundamentals of Physics: A combined edition