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[" 42.A length of a rubber cord is "L(1)...

[" 42.A length of a rubber cord is "L_(1)" metre when a tension of "3N" is applied.The length "],[" becomes "L_(2)" metre when the tension is "4N" .The length of the cord in metre when "],[" tension is increased to "9N" is : "],[[" (1) "6L_(2)-5L_(1)," (2) "5L_(2)-6L_(1)," (3) "6(L_(2)-5L_(1))," (4) "5(L_(2)-5L_(1))]]

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