A block of mass 240.0 g is at rest on a plane inclined at 45.0 degrees to the horizontal. The coefficient of kinetic friction between the block and the plane is 0.070. The block is attached to a second block of mass 580.0 g that hangs freely by a string that passes over a frictionless and massless pulley, at the top of the incline. Find the speed of the second block when it has fallen 38.0 cm.