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A uniform string of length 20m 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)
(JEE-Main-2016]
(1) V2s
(2) 212s
(3) 2s
(4) 2V2s
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