More acceleration practice , PLEASE HELP ME 1.A race car starts and finishes a race that is 50,000m. (30miles). The time is 23 minutes. The final velocity is 67m/s. What is the average acceleration?

2.The same car, after crossing the finish line, has a velocity of 45m/s. after 25 seconds. What was the acceleration for this time period?

3.The same car, after the time period in question 2, within 0.5 minute, slows to a constant speed of 20m/s. What was its acceleration for this time period? What is its acceleration after this 0.5 minute time period?

4.The same car, then follows a curve in the road at the same speed. Describe its acceleration. This same car then accelerates at 2m/s2. What will be its velocity after 10 seconds?