Table 2-1  Basic Quantities Used in Describing Motion

Term Position Displacement Instant Time Interval Meaning Number line or coordinate axis reading, point in space Space interval Clock reading, point in time Time duration, time elapsed Symbol x Δx = x2 − x1 t Δt = t2 − t1 Question addressed Where … ? How far … ? (and sign tells, Which way … ?) When … ? At what time … ? How long … ? How much time … ?

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