I need help answering those questions. I don't know how to solve them.

4. A car is traveling at a velocity of 50 m/s. It then decelerates at a constant rate of 1.5 m/s' 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 m/s 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 480 meters? 6. An airplane, flying at an initial velocity of 180 m/s, accelerates at a constant rate for 5 seconds. Its final velocity is 225 m/s. What was its acceleration