A driver in a moving car applies the brakes. The car slows to a final speed of 1.80 m/s over a distance of 40.0 m and a time interval of 8.30 s. The acceleration while braking is approximately constant.
1. What is the car's original speed before braking?
2. What is its acceleration during this time? (The car's initial velocity is in the positive direction. Indicate the direction with the sign of your answer.)