The small slider A moves with negligible friction down the tapered block, which moves to...

The small slider A moves with negligible friction down the tapered block, which moves to the right with constant speed v = v₀. Use the principle of work-energy to determine the magnitude v_A of the absolute velocity of the slider as it passes point C if it is released at point B with no velocity relative to the block. Apply the equation, both as an observer fixed to the block and as an observer fixed to the ground, and reconcile the two relations.