1. Compute your average velocity in the following two cases: 1. You walk 73.2 m at a speed of 1.22 m/s and then run 73.2 m at a speed of 3.05 m/s along a straight track. 2. You walk for 1.00 min at a speed of 1.22 m/s and then run for 1.00 min at 3.05 m/s along a straight track. 3. Graph x versus t for both cases and indicate how the average velocity is found on the graph.