As physics

Describe how the vertical component of the velocity of the water varies form point X to point Z?

Image with a flat horizontal line with a curve on top (beg curve: X, top middle curve: Y, End bottom curve: Z)

Mark scheme Answer:

decreases from x to y
DON’T GET I thought it INCREASES
zero at y,x,z
I UNDERSTAND
increases from y to z
DON’T GET I THOUGHT IT DECREASES
positive from x to y and negative from y to z(or vice versa)
DON’T GET HOW IT COULD BE VICE VERSA

Please help and clearly explain the things I don’t understand and why.

Explain why it decreases from x to Y and increases from y to z

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  1. Here I've already written what I thought of the question in caps lock and the thing I dont know at the bottom.

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  2. I do not have your picture.

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  3. Y
    - -
    - -
    - -
    - -
    - -
    X Z

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  4. Y
    -- -
    -- --- -
    - ----- -- -
    -------------- -
    - ----------------- -

    X Z

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  5. ...........---y----
    .........-----------
    ......-------------------
    ...--------------------------
    . x----------------------------z

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  6. It looks kinda like the last image i posted but its a curve

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  7. and equal on both side

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  8. ...........---y----
    .........-----------
    ......-------------------
    ...--------------------------
    . x----------------------------z
    is the picture

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