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A particle is projected with speed \( u \) at angle \( \theta \) with horizontal from ground. If it is at same height from
\( \mathrm{P} \) ground at time \( t_{1} \) and \( t_{2} \), then its average velocity

W. in time interval \( t_{1} \) to \( t_{2} \) is
(1) Zero
(2) \( u \sin \theta \)
(3) \( u \cos \theta \)
(4) \( \frac{1}{2}[u \cos \theta] \)
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