Given data
*The initial speed of the driver is u = 24 m/s
*The final speed of the driver is v = 15 m/s
*The given time is t = 12 s
The formula for the automobile's acceleration is given as
[tex]a=\frac{v-u}{t}[/tex]Substitute the values in the above expression as
[tex]\begin{gathered} a=\frac{15-24}{12} \\ =-0.75m/s^2 \end{gathered}[/tex]