A sled starts from rest at the top of a hill and slides down with a constant acceleration. At some later time it is 14.4 m from the top; 2.00 s after that it is 25.6 m from the top, 2.00 s later 40.0 m from the top, and 2.00 s later it is 57.6 m from the top. Question A.) What is the acceleration of the sled? ___ m/s^2 Question B.) What is the speed of the sled when it passes the 14.4-m point? ___ m/s it's hard to start this problem because i dont know the initial time, can someone help me with this problem?