A ball moves in a straight line (the x-axis). The graph in Fig. E2.9 shows this ball’s velocity as a function of time. (a) What are the ball’s average speed and average velocity during the first 3.0 s? (b) Suppose that the ball moved in such a way that the graph segment after 2.0 s was -3.0 m/s instead of +3.0 m/s. Find the ball’s average speed and average velocity in this case.

Step 1 of 4

a)

Average speed, s = Total distance travelled by the object/Total time.

In this problem, the velocity of the ball in first two seconds is, .

Therefore, the total distance travelled by the object at first two seconds,

The total distance travelled by the object in between 2nd and 3rd second is,

Therefore, the total distance travelled by the object,

Total time taken,

Average speed of the ball, s = 7 m / 3 s = 2.33 m/s