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A particle of mass m is fixed to one end of a light spring having force constant k and unstretched length l. The other end is fixed. The system is given an angular speed ω about the fixed end of the spring such that it rotates in a circle in gravity free space. Then the stretch in the spring is :

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The correct answer is 

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Answer is (2) mlω2/(k - mω2)

2(l + x) kx

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