A ball is thrown at an angle \( \theta \) with the horizontal. Its ...

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A ball is thrown at an angle \( \theta \) with the horizontal. Its kinetic energy is \( 100 \mathrm{~J} \) and it becomes \( 30 \mathrm{~J} \) at the
\( \mathrm{P} \) highest point. The angle of projection is-

W
(1) \( 45^{\circ} \)
(2) \( 30^{\circ} \)
(3) \( \cos ^{-1}\left(\frac{3}{10}\right) \)
(4) \( \cos ^{-1}\left(\sqrt{\frac{3}{10}}\right) \)
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