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cw1=2100J/kg*C
t1=10C
m2=?
cw2=385J/kg*C
t2=50C
tk=40C
m1*cw1*(tk-t1)=m2*cw2*(t2-tk)
m2=m1*cw*(tk-t1)/cw2*(t2-tk)
m2=0.01*2100*(40-10)/385*(50-40)
m2=0.1636 kg