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Average torque on a projectile of mass m...

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 figure, about the point of projection is :
.

A

`(m u^(2)sin(2theta))/(2)`

B

`m u^(2)cos(theta)`

C

`m u^(2)sin(theta)`

D

`(m u^(2)sin (theta))/(2)`

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The correct Answer is:
A
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