Chapter 2.1, Problem 3ES

The accompanying figure shows the position versus time curve for a certain particle moving along a straight line. Estimate each of the following from the graph:

(a) the average velocity over the interval $0\le t\le 3$

(b) the values of $t$ at which the instantaneous velocity is zero

(c) the values of $t$ at which the instantaneous velocity is either a maximum or a minimum

(d) the instantaneous velocity when $t=3\text{ s}$ .