Will two dimensional motion with an acceleration only in one dimension?

A football is kicked by a player with certain angle to the horizontal. Is there any point at which velocity is perpendicular to its acceleration.

Give any two examples for parallelogram law of vectors.

Why does rubber ball bounce greater heights on hills than in plains?

The V-t graphs of two objects make angle 30° and 60° with the time axis. Find the'ratio of their accelerations.