Answer:
[tex]-9.875 m/s^{2}[/tex]
Explanation:
Acceleration, [tex]a=\frac {v-u}{t}[/tex]
Where v and u are the final and initial velocities of Alice's car respectively, t is the time taken for Alice's car to attain velocity of 7 m/s.
Substituting 7 m/s for v, 86 m/s for u and 8 s for t then
[tex]a=\frac {7-86}{8}=-9.875 m/s^{2}[/tex]
Therefore, the car decelerates at a rate of [tex]9.875 m/s^{2}[/tex]
