The length of an elastic string is \[a\] metre when the longitudinal t – McqOptions

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1.	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.	\[2a-\frac{1}{4}a\]
D.	\[4a-3b\]
Answer» C. \[2a-\frac{1}{4}a\]

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