A uniform string of length


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 starts moving up the string. The time taken to reach the support is :(take $\mathrm{g}=10 \mathrm{~ms}^{-2}$ )


  1. $\sqrt{2} \mathrm{~s}$

  2. $2 \pi \sqrt{2} \mathrm{~s}$

  3. $2 s$

  4. $2 \sqrt{2} \mathrm{~s}$

Correct Option: , 4


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