Question

explain the relative displacement and it's cases​

Answer 1

Relative displacement is calculated in exactly the same way if you know the components of the position vectors of A and B. ( Position vectors are displacements relative to the origin.) There is no need for A or B to start at the origin, but either or both can - it just depends on the question.

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Answer 2

Explanation:

consider two particles A and B moving alone the X - axis with uniform velocity vA and vB