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There is no such thing as exactly vertical because either it is vertical or it is not. You cannot have approximately vertical - it is not vertical, then. Vertical means at 90 degrees to the horizon (or horizontal).
The abscissa.
A pentagon has five corners, or vertices. There is no such thing as a "vertical corner."
A T-Square is a drafting tool for drawing straight horizontal and vertical lines, relative to the edge of the drafting board.
No. The vertical coordinate tells the speed in this case. The slow is the derivate of the speed, i.e., the acceleration.