Thank you for the clarification!
Just to make sure I understand it this, if I was given the change in distance, the velocity, and acceleration, I would have to use (xf-xi) = vi t + at^2/2 to find t but I can't use vf = vi + at, because this doesn't account for the change in distance ?
I would greatly appreciate it if someone can clarify the conditions on when to use to each of the kinematics equations, because I end up with the wrong answer for using the wrong equations of the 3.
1. vf = vi + at
When can I use this and when cannot?
2. vf^2 = vi^2 + 2a(xf-xi)
When can I use...