A 0.4 kg bead slides on a curved wire, start- ing from rest at point A as shown in the figure. The segment from A to B is frictionless, and the segment from B to C is rough. The point A is at height 9.4 m and the point C is at height 1.4 m with respect to point B. A 9.4 m 1.4 m B Find the speed of the bead at B. The accel- eration due to gravity is 9.8 m/s. Answer in units of m/s. If the bead comes to rest at C, find the change in mechanical energy due to friction as it moves from B to C. Answer in units of J.