A 6 kg weight is fastened to the end of a steel wire of unstretched length 60 cm. It is whirled in a vertical circle and has an angular velocity of 2 rev/s at the bottom of the circle. The area of cross-section of the wire is 0.05 cm2. Calculate the elongation of the wire when the weight is at the lowest point of the path. Young's modulus of steel = 2 x 1011 N/m2.