Pendulum problem?

a 15kg ball of radius 4cm is suspended from a point 2.94m above the floor by an iron wire of unstretched length 2.85m. the diameter of a wire is 0.090cm and it's young's modulus is 1.8*10to the 11 power N/msquared. if the ball is set swinging so that its center pes through the lowest point at 5m/s by how much does the bottom of the ball clear the floor?