A uniform string of length \( 20 \mathrm{~m} \) is suspended from a...

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A uniform string of length \( 20 \mathrm{~m} \) is suspended from a rigid support. A short wave pulse is introduced at its lowest end. It
\( \mathrm{P} \) starts moving up the string. The time taken to reach the support is (take \( g=10 \mathrm{~ms}^{-2} \) )
[JEE (Main) 2016]
W
(a) \( 2 s \)
(b) \( 2 \sqrt{2} s \)
(c) \( \sqrt{2} \mathrm{~s} \)
(d) \( 2 \pi \sqrt{2} s \)
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