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A 15 kg mass fastened to the end of a st...

A 15 kg mass fastened to the end of a steel wire of unstretched length 1.0 m is whirled in a vertical circle with an angular velocity of `2 rev s^(-1)` at bottom of the circle. The cross-section of the wire is `0.05 cm^(2)`. The elongation of the wire when the mass is at the lowest point of its path is
`(Take, g= 10 m s^(-2), Y_("steel")= 2xx^(11) N m^(-2))`

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