Answer on Mechanics | Relativity Question for Riyank
If we have a distance-time graph, s(t), its slope is ds/dtwhich essentially is an increment of distance divided by the corresponding
increment of time, which is the speed by definition. The traveled distance, and the speed, can be only positive(zero or above). The displacement, on the other hand, can be either positiveor negative with reference to some origin point. The velocity is the derivative of displacement over time and it can have both signs as well.
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