A length of a rubber cord is L₁ meter when tension of 4 N is applied. The length become s L₂ meter when tension is 5 N. The length of the cord in meter, when tension is increased to 9 N is : 5 L₁ - 4 L₂ 5 L₂ - 4 L₁ (a) (c) (b) 4 L₁-5 L₂ (d) 4 L₂-5 L₁
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