Suppose an object is at point \( P \) at time \( t \) moves to \( P^{\prime} \) and then comes b...

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Suppose an object is at point \( P \) at time \( t \) moves to \( P^{\prime} \) and then comes back to \( P \). Then, displacement is a
(a) unit vector
(b) null vector
(c) scalar
(d) None of these
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