The stone A used in the sport of curling slides over the ice track and strikes another

Question:

The €œstone€ A used in the sport of curling slides over the ice track and strikes another €œstone€ B as shown. If each €œstone€ is smooth and has weight of 47 lb, and the coefficient of restitution between the €œstones€ is e = 0.8, determine their speeds just after collision. Initially A has a velocity of 8ft/s and B is at rest. Neglect friction.

The “stone” A used in the sport