9. Define relative velocity. How does relative velocity
change if the velocity of
(i) both bodies in increased by same amount.
(ii) both bodies in decreased by same amount.
(iii) One of the body becomes negative.
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when two bodies move with the same velocities, v A = v B. So, for case1: If the bodies move in the same direction, the relative velocity is zero. This means that both see each other at rest. However, (case 2:) if they move in opposite directions, the relative velocity is twice the velocity of the bodies.
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