A steel ball of mass $m_1 = 1 \mathrm{kg}$ moving with velocity $50 \mathrm{m} {\mathrm{s}}^{-1}$ collides with another ball of mass $m_2 = 200 \mathrm{g}$ lying on the ground. Due to collision, the KE is lost and their internal energies change equally and $T_1$ and $T_2$ are the temperature changes of masses $m_1$ and $m_2$, respectively. If the specific heat of steel is unity and $J = 4.18 \mathrm{J} {\mathrm{cal}}^{-1}$, then