Any shape at all - other than a straight line. It could be a smooth curve, or a zigzag or a set of disconnected bits - whatever.
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Linear = Straight line! So, a graph of a linear relationship is a straight line.
It's linear, so it's a line...
a line
It is in the shape of a parabola
If the Object is falling at a constant velocity the shape of the graph would be linear. If the object is falling at a changing velocity (Accelerating) the shape of the graph would be exponential- "J' Shape.