FIGURE EX2.4 is the position-versus-time graph of a bicycle. What is the bicycle's velocity at (a) t = 5s

(II) In Fig. 2–40, (d) Does the object move in one direction or in both directions during the time shown?

<IMAGE>

Figure 2–55 shows the position vs. time graph for two bicycles, A and B.

(a) Identify any instant at which the two bicycles have the same velocity.

<IMAGE>

Figure 2–55 shows the position vs. time graph for two bicycles, A and B.

(b) Which bicycle has the larger acceleration?

<IMAGE>

The position-time graph for a moving box is shown below.

(a) What is the box's average velocity from 0 to 5s?
(b) What is the box's average velocity from 0 to 8s?
(c) What is the box's velocity in the interval where it's moving fastest?

The position-time graph for a ball on a track is shown below.
(a) What is the ball's velocity at 4s?
(b) At what time(s) is the ball approximately travelling at -10m/s?
(c) From t = 3 to 7s, what is the sign of the acceleration?