A particle suspended by a light inextensible thread of length \( l \) is projected horizontally ...

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A particle suspended by a light inextensible thread of length \( l \) is projected horizontally from its
\( \mathrm{P} \) lowest position with velocity \( \sqrt{7 g l l} 2 \). The string will slack after swinging through an angle

W equal to
(a) \( 30^{\circ} \)
(b) \( 90^{\circ} \)
(c) \( 120^{\circ} \)
(d) \( 150^{\circ} \)
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