JEE Main Physics question

PhysicsMechanical Properties of SolidsJEE Main

The length of a rubber cord is metre when the tension is 4 N and metre when the tension is 6 N. The length when the tension is 9 N, is [Kerala CEE 2007]

Answer: (A)

Solution

For an elastic cord, tension where is the natural length and is the force constant. From and , eliminating gives

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Question ID VK-154843