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A body is hanging from a rigid support by an inextensible string of length I. It is struck inelastically by an identical body of mass m with horizontal velocity v=2gl, the tension in the string increases just after striking by {AFMC 2012] 

a
mg
b
3 mg
c
2  mg
d
None of these

detailed solution

Correct option is C

Tension in the string,T=2mv'2l+2mg=m(2gl)2l+2mg∵2mv'2l= Centrifugal force and v'=v2=gl2∴ Increase ill tension = 3 m g-m g=2 m g

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