A driver in a car traveling at a speed of 21.8 m/s sees a car 101 m away on the road. How long will it take for the car to uniformly decelerate to a complete stop in exactly 99 m?
Since we know that velocity is uniformly decelerating, we can take the average velocity:
Now we know
Substitute our velocity of 10.9m/s for V and 99m for d:
Finally we get
Hope this helps!