The equations of motion of a projectile are given by \( x=18 t \) and \( 2 y=54 t-9.8 t^{2} \). ...

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The equations of motion of a projectile are given by \( x=18 t \) and \( 2 y=54 t-9.8 t^{2} \). The angle \( \theta \) of projection is
(a) \( \tan ^{-1}(3) \) (b) \( \tan ^{-1}(1.5) \) (c) \( \sin ^{-1} \frac{2}{3} \)
(d) \( \cos ^{-1} \frac{2}{3} \)
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