Water of mass m2=1 kg is contained in a copper calorimeter of mass m1=1 kg. Their common temperature is t=10oC. Now a piece of ice of mass m3=2 kg and temperature −11oC is dropped into the calorimeter. Neglecting any heat loss, the final temperature of the system is [specific heat of copper 0.1 Kcal/kgoC, specific heat of water =1 Kcal/kgoC, specific heat of ice =0.5 Kcal/kgoC, latent heat of fusion of ice =78.7 Kcal/kg]