Ok, I've been running over this problem for about an hour now, and I can't figure out where I'm going wrong. I'm a complete newb, so I'm sure it's something stupid, but I could use the help. 1. The problem statement, all variables and given/known data An object with an initial velocity undergoes constant acceleration. Position information was collected at 4 poins and is shown in the table. Using Yn+1 - Yn = Vnt + (1/2)ayt2 determine the acceleration and fill in each box. edit : it screwed up my table, I hope it makes sense. Point #; Time (s); Position (m); Average Acceleration (m/s2 1; 0; 1; n/a 2; 1; 8; (answer here) 3; 2; 25; (answer here) 4; 3; 52; n/a 2. Relevant equations Yn+1 - Yn = Vnt + (1/2)ayt2 3. The attempt at a solution Here's one attempt I tried. 25m - 8m = 7(1) + 1/2ay(1) ay = 20 I've tried a few different attempts, I'm not sure I should show them all here. The problem I'm running into is that I think I need to plug in velocity figures, but I wasn't given any, so I messed around some, but the answers don't make sense, and aren't uniform.