The open-link chain of length L and mass ρ per unit length is released from rest in the...

The open-link chain of length L and mass ρ per unit length is released from rest in the position shown, where the bottom link is almost touching the platform and the horizontal section is supported on a smooth surface. Friction at the corner guide is negligible. Determine (a) the velocity v₁ of end A as it reaches the corner and (b) its velocity v₂ as it strikes the platform. (c) Also specify the total loss Q of energy.