Average torque on a projectile of mass \( m \), initial speed \( u \) and angle of projection \(...

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Average torque on a projectile of mass \( m \), initial speed \( u \) and angle of projection \( \theta \) between initial and final positions \( P \) and \( Q \) as shown in the figure about the point of projection is
\( \mathrm{P} \)
W
(1) \( \frac{m u^{2} \sin 2 \theta}{2} \)
(2) \( m u^{2} \cos \theta \)
(3) \( m u^{2} \sin \theta \)
(4) \( \frac{m u^{2} \cos \theta}{2} \)
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