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Position, Displacement, and Time

To specify position, we must give three coordinates x, y, and z, generally measured in [meters = m]. The symbol σ stands for the coordinates (x, y, z). If an object moves from one position to another, the vector giving the change in position is the displacement vector, Δs = s2s1. The magnitude of the displacement vector is called the displacement.

Time is a fundamental quantity in classical physics, denoted t, measured in [seconds = s]. Often we will speak of a time interval t = t2t1, that is, the time between a beginning time t1 and ending time t2. An instant is a single moment of time.

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