Resposta :
[tex]\Huge \text {$ \sf F = m.a \dfrac {} {}$} \\\Huge \text {$ \sf 25 = m.2 \dfrac {} {}$} \\\\\Huge \text {$ \sf 25 = 2m \dfrac {} {}$} \\\\\Huge \text {$ \sf m = \dfrac {25} {2}$} \\\\\Huge \text {$ \sf m = 12,5 kg \dfrac {} {}$} \\[/tex]