If two objects \( P \) and \( Q \) move along parallel straight lines in opposite direction with...

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If two objects \( P \) and \( Q \) move along parallel straight lines in opposite direction with velocities \( \mathbf{v}_{P} \) and \( \mathbf{v}_{Q} \) respectively, then relative velocity of \( P \) w.r.t \( Q \),
(a) \( \mathbf{v}_{P Q}=\mathbf{v}_{P}=\mathbf{v}_{Q} \)
(b) \( \mathbf{v}_{P}-\mathbf{v}_{Q} \)
(c) \( \mathbf{v}_{P}+\mathbf{v}_{Q} \)
(d) \( \mathbf{v}_{Q}-\mathbf{v}_{P} \)
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