I am a highschoolhigh school student and I was studying kinematics about position of a body. So, one thing I do not understand in this diagram is the position of woman. Initally, at $t=0$, this woman was at $x=1.5m$$x=1.5\,\text{m}$ from reference frame; but her hands, her legs or any point of the woman are at different positions. So how we can say that this woman is at $x=1.5m$$x=1.5\,\text{m}$? How we can define the position of the woman?
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