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A uniform string of length 20 m is suspe...

A uniform string of length 20 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 g = `10 ms^(-2)`)

A

2s

B

`2 sqrt2s`

C

`sqrt 2 s`

D

`2 pi sqrt 2 s`

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