[tex]Dane:\\T_1 = 10^{o}C\\T_2 = 60^{o}C\\\Delta T = T_2-T_1 = 60^{o}C - 10^{o}C = 50^{o}C\\Q = 2 \ 000 \ J\\c = 4000\frac{J}{kg\cdot^{o}C}\\Szukane:\\m = ?\\\\Rozwiazanie\\\\Q = m\cdot c\cdot \Delta T \ \ \ |:(c\cdot \Delta T)\\\\m = \frac{Q}{c\cdot \Delta T}\\\\m = \frac{2000 \ J}{4000\frac{J}{kg\cdot^{o}C}\cdot50^{o}C} = \frac{2000 \ J}{200000\frac{J}{kg}}\\\\\boxed{m = 0,01 \ kg}[/tex]