[" 7.A uniform string of length "20m" is...

[" 7.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=10ms^(-2))," (B) "2sqrt(2)s],[" (C) "sqrt(2)s," (D) "2 pi sqrt(2)s]]

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[" 7.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=10ms^(-2))," (B) "2sqrt(2)s],[" (C) "sqrt(2)s," (D) "2 pi sqrt(2)s]]

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