A sphere of radius 0.1 m and mass 8πkg  is attached to the lower end of a steel wire of length 5.0 m and diameter10−3m . The wire is suspended from 5.22 m high ceiling of a room. When the sphere is made to swing as a simple pendulum, it just grazes the floor at its lowest point. Calculate the velocity of the sphere at the lowest position. Y for steel =1.994×1011N/m2