Halliday, Resnick & Walker — Motion Along a Straight Line: Problem 21

From \(t = 0\) to \(t = 5.00 \text{ min}\), a man stands still, and from \(t = 5.00 \text{ min}\) to \(t = 10.0 \text{ min}\), he walks briskly in a straight line at a constant speed of \(2.20 \text{ m/s}\). What are (a) his average velocity \(v_{\text{avg}}\) and (b) his average acceleration \(a_{\text{avg}}\) in the time interval \(2.00 \text{ min}\) to \(8.00 \text{ min}\)? What are (c) \(v_{\text{avg}}\) and (d) \(a_{\text{avg}}\) in the time interval \(3.00 \text{ min}\) to \(9.00 \text{ min}\)? (e) Sketch \(x\) versus \(t\) and \(v\) versus \(t\), and indicate how the answers to (a) through (d) can be obtained from the graphs.