A particle is projected horizontally from the top of a cliff of hei...

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A particle is projected horizontally from the top of a cliff of height \( \mathrm{H} \) with a speed \( \sqrt{2 g H} \). The radius of curvature of the trajectory at the instant of
\( \mathrm{P} \) projection will be

W
(A) \( \mathrm{H} / 2 \)
(B) \( \mathrm{H} \)
(C) \( 2 \mathrm{H} \)
(D) \( \infty \)
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