Given that the initial velocity is
[tex]v_i=\text{ 45 m/s}[/tex]
The final velocity is
[tex]v_f=\text{ 0 m/s}[/tex]
The acceleration is a = -4 m/s^2
We have to find the time taken to stop the car completely.
The formula to calculate time is
[tex]t=\text{ }\frac{(v_f-v_i)}{a}[/tex]
Substituting the values, the time will be
[tex]\begin{gathered} t=\frac{0-45}{-4} \\ =11.25\text{ s} \end{gathered}[/tex]
Thus, the time taken is 11.25 s
