Aceleração média :
[tex]\displaystyle \text{a}_{\text m } = \frac{\Delta V}{\Delta \text T}\\\\ \therefore \\\\ \text{a}_{\text m } = \frac{\text V_\text f -\text V_\text o}{\text T_\text f-\text T_\text o}[/tex]
Temos :
[tex]\text V_o = 0 \\\\ \text V_\text f = 240\ \text{km/h}\\\\ \text T_\text o=0\ \text s\\\\ \text T_\text f = 5\ \text s[/tex]
Substituindo :
[tex]\displaystyle \text{a}_{\text m} = \frac{240 \ \text{km/h} - 0}{5\text s - 0 } \\\\\\ \huge\boxed{\text a_\text m = 48 \ \frac{\text{km/h} }{s}}\checkmark[/tex]
letra A
