according to your post, it can be broken down into two times
t=2 and t=8
at t=2 , what I know is x=2A, v=2A, a=A
at t=10, what I know is x=100, v=10 (because v=d/t=100/10, is this relavant?)
there are two eq'ns that come to mind
x(t)= Xi + Vit + 0.5at^2
Vf^2= Vi^2+2a(Xf...