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Average velocity of a particle in projectile motion between its starting point and the highest point of its trajectory is: (projection speed \( =u \), angle of projection from horizontal \( =\theta) \)
(a) \( u \cos \theta \)
(b) \( \frac{u}{2} \sqrt{1+3 \cos ^{2} \theta} \)
(c) \( \frac{u}{2} \sqrt{2+\cos ^{2} \theta} \)
(d) \( \frac{u}{2} \sqrt{1+\cos ^{2} \theta} \)
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