I need help figuring out how to set up this equation properly to solve for average velocity. 1.5m/s is incorrect

orrect Question 1 0 / 10 pts Annie is traveling on a walk at 2.9 m/s. After traveling for 15.8 seconds at a constant velocity she approaches a stoplight which has turned red. Being a good doggo she slows to a stop with an acceleration of -2.12 m/s^2 as she nears the stoplight. What is her average velocity for the entire motion? 1.5