Chapter 2 - One-Dimensional Kinematics - Problems and Conceptual Exercises - Page 49: 21

(a) See the graph (b) $v_{av}=7.4~m/s$

$1~min=60~s$ $t_{0}=0,~t_{f}=(7.5~min)(\frac{60~s}{1~min})=450~s$ $x_{i}=0,~x_{f}=3330~m$ $v_{av}=\frac{\Delta x}{\Delta t}=\frac{x_{f}-x_{i}}{t_{f}-t_{i}}=\frac{3330~m-0}{450~s-0}=7.4~m/s$