The light turns green and you press your foot on the accelerator. Your car, starting from rest, gains a uniform acceleration of 2m/s^2 until you see on the speedometer that you're going 45 miles per hour (1 mile - 1.61km). You continue to travel at 45 miles per hour for 20 seconds. Then you see a stop sign and apply the brakes, stopping
your car with a uniform acceleration within 5 seconds. What is the average velocity of your car?