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Q.

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]

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a

mg

b

3 mg

c

2  mg

d

None of these

answer is C.

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Detailed Solution

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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