Answer:
Acceleration, a = 9.877m/s²
Step-by-step explanation:
Given the following data;
Distance, d = 400m
Time, t = 9secs
Since it's starting from rest, initial velocity, u = 0
To solve for acceleration, we would use the second equation of motion;

Substituting into the values into the equation;


Cross multiplying, we have;

a = 9.877m/s²
Therefore, the automobile would have to accelerate at a constant rate of 9.877m/s²