A car driver uses the brakes to bring a car to rest, with a constant deceleration of $4.0\,\text{m s}^{-2}$ over a time of 8.0 s. What is the average speed of the car during this interval?
- A$4.0\,\text{m s}^{-1}$
- B$8.0\,\text{m s}^{-1}$
- C$16\,\text{m s}^{-1}$
- D$32\,\text{m s}^{-1}$