Answer :
Given that the initial velocity is
[tex]\begin{gathered} V_f=\text{ 2.7 km/h} \\ =2.7\times\frac{1000m}{60\text{ }\times60\text{ seconds}} \\ =2.7\times\frac{10}{36}\frac{m}{s} \\ =2.7\times\frac{5}{18} \\ =0.75\text{ m/s} \end{gathered}[/tex]The acceleration is a = 0.4 m/s^2.
The time is t = 3.6 s.
We have to find the final velocity.
The formula to find the final velocity is
[tex]V_f=V_o+at[/tex]Substituting the values,
[tex]\begin{gathered} V_f=0.75+0.4\times3.6 \\ =2.19\text{ m/s} \end{gathered}[/tex]Thus, the final velocity is 2.19 m/s.