A piece of copper mass 200g is heated 100°C and is then quickly transferred to copper calorimeter of mass 10g, containing 10g of water whose initial temperature is 15°C. If the specific heat capacity of copper and water are 400J/kg.K and 4200J/kg.K, find the final temperature of the substance

• A.29.1°C
• B.30.1°C
• C.28.4°C
• D.27.4°C