A transverse wave is passing through a stretched string with a speed of \( 20 \mathrm{~m} / \mat...

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A transverse wave is passing through a stretched string with a speed of \( 20 \mathrm{~m} / \mathrm{s} \). The tension in the
P string is \( 20 \mathrm{~N} \). At a certain point \( \mathrm{P} \) on the string,

W it is observed that energy is being transferred at a rate of \( 40 \mathrm{~mW} \) at a given instant. Find the speed of point \( P \).
(1) \( 40 \mathrm{~cm} / \mathrm{s} \)
(2) \( 20 \mathrm{~cm} / \mathrm{s} \)
(3) \( 2 \mathrm{~mm} / \mathrm{s} \)
(4) \( 20 \mathrm{~mm} / \mathrm{s} \)
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