An object is dropped vertically down on earth. The \( \mathrm{P} \)...

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