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A unknown weight falls through 1 cm on a collar rigidly attached to the lower end of a vartical bar 3 cm long and 6 cm2 in section. If the maximum instantaneous extension is 2 mm the value of stress would be

[A].	500 kg/cm2	[B].	667 kg/cm2
[C].	1000 kg/cm2	[D].	1333 kg/cm2
[E].	1500 kg/cm2

Answer: Option D

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