You have 500 g of hot water at 50oC in a well-insulated thermal cup. You think the water is too hot and drop 100 g of ice that is at -5oC into the water. Assume that you were super fast when adding the ice in and closing the cap quickly so no heat of the system is lost. What is the final temperature of the water when the system reaches thermal equilibrium and all the ice are melted?

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