A piece of metal at $850 \mathrm{~K} is dropped in to 1 \mathrm{~kg} water at 300 \mathrm{~K}. If the equilibrium temperature of water is 350 \mathrm{~K} then the heat capacity of the metal, expressed in \mathrm{JK}^{-1} is (1 \mathrm{~cal}=4.2 \mathrm{~J})