The length of an elastic string is 5 metre when the longitudinal tension is 4 N and 6 metre when
Channel: Doubtnut
Date: 26/01/2020

The length of an elastic string is 5 metre when the longitudinal tension is 4 N and 6 metre when the tension is 5 N. If the length of the string (in metre) is \"2X\" when the longitudinal tension is 9 N (assume Hooke�s law is valid) then the value of X will be :