A copper ball of mass 100 gm is at a temperature T. It is dropped in a copper calorimeter of mass 100 gm, filled with 170 gm of water at room…

A copper ball of mass $\displaystyle 100$ gm is at a temperature T. It is dropped in a copper calorimeter of mass $\displaystyle 100$ gm, filled with $\displaystyle 170$ gm of water at room temperature. Subsequently, the temperature of the system is found to be $\displaystyle 75$°C. T is given by : (Given : room temperature $\displaystyle =30^{\circ} \mathrm{C}$, specific heat of copper $\displaystyle =0.1 \mathrm{cal} / \mathrm{gm}^{\circ} \mathrm{C}$ )