Resposta :
[tex]\begin{gathered}\LARGE\boxed{\begin{array}{lr}\sf \: \text{$\sf F = m \cdot a$} \\\\\sf \: \text{$ \sf F = 3 \red{\left[Km \right]} \cdot 5 \red{\left[ \dfrac{m}{s {}^{2} } \right]}$} \\\\\sf {\boxed {\text{$\sf F = 15 \red{\left[ N \right]} $}}} \end{array}}\end{gathered}[/tex]