Number Help A car is travelling north at a speed 7.1 m/s toward an intersection when the traffic light turns red. It takes the car 8.3 seconds to stop. (a) What is the car's average acceleration? (b) What is the direction of the car's average acceleration? west south north east Number Help A car is travelling north at a speed 7.1 m/s toward an intersection when the traffic light turns red. It takes the car 8.3 seconds to stop. (a) What is the car's average acceleration? (b) What is the direction of the car's average acceleration? west south north