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Q = m * cw * (tk - tp )
1000 J = 0,5 kg * 500 J/kg * C * [ tk - (-25 C)]
1000 J = 250 J/C * ( tk + 25 C ) /:250 J/C
1000 J /250 J/ C = tk + 25 C
4 C = tk + 25 C
tk = 4 C - 25 C
tk = - 21 C