A 2.0-kg metal object with a temperature of 90 °C is submerged in 1.0 kg of water at 20 °C. The water-metal system reaches equilibrium at 32 °C. What is the specific heat of the metal?
a) 0.840 kJ/kg K
b) 0.129 kJ/kg K
c) 0.512 kJ/kg K
d) 0.433 kJ/kg K
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