A particle is projected vertically upwards with a velocity \( u \) from a point \( O \). When it...

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A particle is projected vertically upwards with a velocity \( u \) from a point \( O \). When it returns to the point of projection :
(A) Its average velocity is zero
(B) Its displacement is zero
(C) Its average speed is \( u / 2 \)
(D) Its average speed is \( u \)
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