When two bodies moves in the same straight line, we compare their motion related to relative velocity. If two bodies A and B are moving in a straight line with speed VA and VB frequently, the relative velocity of body A with respect to object B is given by , VAB = VA-VB
where VB is known reference object velocity
It follows that the relative velocity of object B with respect to object A will be, VBA = VB-VA
where VA is known reference object velocity
Key points regarding relative motion while calculating relative velocity:
(i) Relative velocity of a particle = velocity of a particle - velocity of reference object
(ii) If the velocity of a particle be VA and the velocity of a reference object be VB then the relative velocity of the particle VAB = VA-VB
(iii) Relative velocity of a particle while moving in the same direction.
Relative velocity = VA-VB
(iv) Relative velocity of a particle while moving in the opposite direction.
Relative velocity = VA+VB
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