7. Sydney and Lyn are on opposite sides of a 100m track, watching Ava sprint the distance. Starting from rest, it takes 153 for Ava to nish the race. Assuming Ava has a constant acceleration, find Ava's acceleration... a. From the perspective of Lyn, who is standing next to the start. b. From the perspective of Sydney, who is standing at the nish You must solve this question twice, with two different reference frames. In each reference frame, the viewer is at their own origin and the direction they facing is considered positive