Question

Physics help!
Identify a coordinate system you could use to describe the motion of a girl swimming across a rectangular pool.

Also:
Two students added a vector for a moving object's position at t = 2 s to a motion diagram. When they compared their diagrams, they found that their vectors did not point in the same direction. Explain. ... I think that it's because the moving object is slowing down? <-- I'm not sure if that's a good enough answer, so I'd like to be checked on that..

Thanks!