A body is projected with a speed \( u \mathrm{~m} / \mathrm{s} \) at an angle \( \beta \) with t...

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A body is projected with a speed \( u \mathrm{~m} / \mathrm{s} \) at an angle \( \beta \) with the horizontal. The kinetic energy at the highest point is \( \frac{3}{4} \) th of the initial kinetic energy. The value of \( \beta \) is
[WB-JEE 2010]
(a) \( 30^{\circ} \)
(b) \( 45^{\circ} \)
(c) \( 60^{\circ} \)
(d) \( 120^{\circ} \)
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