The important thing to realize is that the point of view of the oberver is called the frame of reference.
In the animation above, the ball would be falling horizontally from the frame of reference of the man on the boat.
If the frame of reference is the lady, the ball would follow a parabolic path.
Its an identical situation - but the motions are different depending on the frame of reference.
Another example: If we had a mosquito flying in a car, from the driver's frame of reference, the mosquito flies at "mosquito speed"
From a person on the sidewalk, the mosquito travels at "car speed + mosquito speed". Again, same situation but different speeds depending on the frame of reference.
So...Study Guide says "When a frame of reference is adopted,the position of the observer in that frame becomes the zero of position. If the frame is a moving on, the zero of position moves with observer"
To understand this situation consider this scenario:
The last point is crucial -> V (A relative to B) = V(A) - V(B)
Do not confuse this with HL Math vectors where AB = b - a
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