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The answer is (E) Speed, the magnitude of the velocity, can only be positive or zero. Graphically,
speed is rEprEEented by the length of the velocity vector. In one dimensional
motion, you can refer to a negative velocity, but this speciﬁes the direction of
motion not the speed. Two trains moving in the opposire direcrion o! the some speed. 'lI'ELDCIT‘I" IS A lli"E‘.'ZT'|:IIH 1I'lII'I'I-I A AMGHI'I'UEIE AND A DIRECTID'H. ‘lI'ELDCIT'I' MDT IZIII'IL'IIr DESERIII
HDW FAST SDMEI'HIHE IS GOING BUT IN WHAT DIRECTION. SPEED IS ONLY THE AMENITUDE. SPEED ANSWERS ﬂML‘I‘ THE QUESTIﬂN. I-IDW FAST?
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- Spring '09