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A ladder \( 5 \mathrm{~m} \) in length is resting against vertical
\( \mathrm{P} \) wall. The bottom of the ladder is pulled along the

W. ground away from the wall at the rate of \( 1.5 \mathrm{~m} / \mathrm{sec} \). The length of the height point of the ladder when the foot of the ladder \( 4.0 \mathrm{~m} \) away from the wall decreases at the rate of
(A) \( 2 \mathrm{~m} / \mathrm{sec} \)
(B) \( 3 \mathrm{~m} / \mathrm{sec} \)
(C) \( 2.5 \mathrm{~m} / \mathrm{sec} \)
(D) \( 1.5 \mathrm{~m} / \mathrm{sec} \)
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