(Solved): (10\%) Problem 9: As a runner crosses the finish line of a race, she starts decelerating from a ve ...

(10\%) Problem 9: As a runner crosses the finish line of a race, she starts decelerating from a velocity of \( 9 \mathrm{~m} / \mathrm{s} \) at a rate of \( 2 \mathrm{~m} / \mathrm{s}^{2} \). Take the runner's velocity as she crosses the finish line to be in the positive direction. \( \otimes 50 \% \) Part (a) What is the runner's displacement, in meters, during the first 5 seconds after crossing the finish line? \[ d= \]