a 0.50 kg heavy hammer head hits 6.0 g of steel nail 15 times at a speed of 2 m / s. assume that 20% of the kinetic energy of the hammer is converted to heat. how much does the temperature of the nail increase 

there is no heat capacity in the question, this is a thermodynamic question. We do have Cp of steel (0,46 kj/kg K) and iron (0,45 Kj/Kg K)