Kinematics in Two Dimensions

Motion in two dimensions involves vector quantities:

          displacement           (x, y)
          velocity               (vx, vy)
          acceleration           (ax, ay)

Under ordinary circumstances, we can separate the components of a 2-D problem, creating two independent 1-D problems. We can use the equations of motion in 1-D to solve each of those simpler problems.
Occasionally, you may not have enough information (three different kinematic quantities) to determine the motion of an object in one of the dimensions; try to solve the motion in the other dimension, because often that will provide one extra piece of information.

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