If the average velocity during the athlete's walk back to the starting line in Guided Example 2.5 is – 1.50 m/s, how much
time does it take for the athlete to walk back to the starting line?

22. the top of a cliff is located a distance h above the ground. at a distance h/2 there is a branch that juts out from the side of the cliff, and on this branch a bird's nest is located. two children throw stones at the nest with the same initial speed, one stone straight downward from the top of the cliff and the other stone straight upward from the ground. in the absence of air resistance, which stone hits the nest in the least amount of time?