I need help with those problems. I don't know how to solve them.

4. A car is traveling at a velocity of 50 mls. It then decelerates at a constant rate of 1.5 ms2 until it comes to a stop. A) How many seconds does it take for the car to stop? B) How far does the car travel before it stops? 5. Starting from a dead stop, a car accelerates to a velocity of 60 mfs in a distance of 480 m. A) What was the car's acceleration? B) How many seconds did it take the car to travel the 430 meters