(Ill) Mary and Sally are in a foot race (Fig. 2-43). WhenMary is 22 m from the finish line, she has a speed of 4.0 m/sand is 5.0 m behind Sally, who has a speed of 5.0 m/s. Sallythinks she has an easy win and so, during the remainingportion of the race, decelerates at a constant rate of0.50 m/s2 to the finish line. What constant acceleration doesMary now need during the remaining portion of the race, ifshe wishes to cross the finish line side-by-side with Sally?

Chapter 10 – Rotation of a Rigid Object About a Fixed Axis 10.1 – Angular Position, Velocity, and Acceleration kinematics are similar to translational motion - instead of x or y for position, we use θ for angular position s=rθ arc length s is related to angular position: π *The unit used for θ is the radian: θ rad)= θ (deg) 180° θf−θ i ∆θ - average angular speed: ω avg t −t = ∆t f i ∆θ dθ - instantaneous angu