Construct a possible graph for the x velocity versus time, v_x(t)

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1man
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For the motion diagram given , sketch the shape of the corresponding motion graphs in Parts A to D. Use the indicated coordinate system. One unit of time elapses between consecutive dots in the motion diagram.
Motion diagram of a projectile on x-y axes with origin O: seven black dots joined by green velocity arrows, rising from O to a peak then falling back to the x-axis at the right.


I've already constructed an x vs t and y vs t graph please help me with these because i don't know how to do these.
Construct a possible graph for the x velocity versus time, v_x(t).
Construct a possible graph for the y velocity versus time, v_y(t).
 

Discussion

Look carefully - distance on x-axis varies uniformly whereas it does not on y-axis. Does this suggest something to you?
 

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