Correct Answer: B
Solution :We have, \[F=kx\] where, F, x and k are force, length and constant respectively. \[\therefore \] \[5=kx\] ?.(1) and \[7=ky\] ?.(2) Multiplying eq. (2) by 2 \[14=2ky\] Subtracting eq (1) from (3), \[14-5=2ky-kx\] or \[9=k(2y-x)\] Hence, required length \[=2y-x\]
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