1. The problem statement, all variables and given/known data Well I've pretty much boiled the problem down to this: Let a = 1.767+0.3213t v(0)=0 x(0)=0 then I got x(t)=(0.8835+0.05355 t) t^2 Given x=6.1 Solving for t I got t=2.45175 But i'm just curious. If I calculate average acceleration I get a_av=2.16. If I now apply x=1/2at^2 using a average I don't get 6.1 2. Relevant equations Using calculus I turned a=1.767+0.3213t to x=(0.8835+0.05355 t) t^2 Given x is 6.1 I solve t=2.45175 3. The attempt at a solution But now when I use the average velocity trick and then use x= 1/2at^2 I don't get 6.1. Is my solution incorrect?