Suppose an insect is at a point A(x1, y1, z1) at t = t1. It reaches at point B(x2, y2, z2) at t = t2 through path ACB with respect to the frame shown in fig. The actual length of curved path ACB is the distance travelled by the insect in time Δt = t2 - t1.
If we connect point A(initial position) and point B(final position) by a straight line, then the length of straight line AB gives the magnitude of displacement of insect in time interval Δt = t2 – t1.
The direction of displacement is directed from A to B through the straight line AB from the concept of vector, the position vector of
