Final answer:
If a car is traveling at constant velocity from left to right and the driver pushes down on the brakes, the car will experience a change in acceleration, with the velocity vector pointing to the right and the acceleration vector pointing to the left.
Step-by-step explanation:
In this scenario, if a car is traveling from left to right at a constant velocity and the driver pushes down on the accelerator, the car will accelerate to the right. This is because the acceleration vector will match the velocity vector, both pointing to the right. However, if the driver then pushes down on the brakes, the car will experience a change in acceleration. The velocity vector will still point to the right, but the acceleration vector will now point to the left. So, the correct answer is (b) Push down on the accelerator and then (b) push down on the brakes.