Water of mass m2 = 1 kg is contained in a copper calorimeter of mass m1 = 1 kg. Their common temperature t = 100C. Now a piece of ice of mass m3 = 2 kg and temperature is −110C dropped into the calorimeter. Neglecting any heat loss, the final temperature of system is. [specific heat of copper = 0.1 Kcal/ kg0C, specific heat of water = 1 Kcal/kg0C, specific heat of ice = 0.5 Kcal/kg0C, latent heat of fusion of ice = 78.7 Kcal/kg]