A slender rod is 80.0 cm long and has mass 0.270 kg . A small 0.0200-kg sphere is welded to one end of the rod and a small 0.0500-kg sphere is welded to the other end. The rod pivoting about a stationary frictionless axis at its center is held horizontal and released from rest. What is the linear speed of the 0.0500-kg sphere as its passes through its lowest point?