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98. The length of an elastic string is a metre when the longitudinal tension is 4 N and b metre when the longitudinal tension is 5 N. The length of the string in metre when the longitudinal tension is 9 N is

(a)   a-b                                            (b) 5b-4a

(c) 2b-(1/4)a                                  (d) 4a-3b

Answer-b

(10)

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