^Displacement

Suppose a body is moving along a straight line. Let the straight line is along x – axis. Let at a time t₁ it was situated at point A at a distance x₁ from a fixed point O. Let it moves & at time t₂ reaches point B situated at a distance x₂ from O.

Here the distance AB is called displacement of the body along x axis (S_x) in the time interval t₂ – t₁ (= Dt). In terms of position coordinates it can be expressed as

Displacement, AB = OB – OA = x₂ – x₁ or Δx.

i.e. for motion along displacement is equal to the change in position coordinates along that line.