An object is dropped vertically down on earth. The change in its speed after falling through a d...

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An object is dropped vertically down on earth. The change in its speed after falling through a distance \( \mathrm{d} \) from its highest point is
(1) mgd
(2) \( \sqrt{2 g \mathrm{~d}} \)
(3) \( 2 \sqrt{g / d} \)
(4) \( 2 \sqrt{\frac{\mathrm{mg}}{\mathrm{d}}} \)
\( \mathrm{P} \)
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