a block of weight 10N is fastened to one end of a wire of crosss sectional area 3mm2 and is rotated in a vertical circle of radius 20cm.the speed of the block at the bottom of the circle is 20m/s.find the elongation of the wire when the block is at the bottom of the circle.the young's modulus of the material of the wire is2^100000000000n/m2.
