hello I need help with the following question please and thank you.

3.) A sled starts from rest at the top of a hill and slides down with a constant acceleration. At some later time it is 14.4m from the top; 2.00s after that it is 25.6m from the top, 2.00s later 40.0m from the top, and 2.00s later it is 57.6m from the top. (a) What is the magnitude of the average velocity of the sled during each of the 2.00s intervals after passing the 14.4m point? (b) What is the acceleration of the sled? (c) What is the speed of the sled when it passes the 14.4m point? (d) How much time did it take to go from the top to the 14.4m point? (e) How far did the sled go during the first second after passing the 14.4m point