Answer:

Step-by-step explanation:
Since the car is moving in a single direction, we can use the following kinematic equation to find its acceleration
:

Where:
is the car's final velocity (we are told it comes to a stop)
is the car's initial velocity
is the car's acceleration
is the distance travelled by the car
Isolating
:

Solving the equation with the given data:

Finally, the acceleration is:
Note the negative sign indicates the car was decreasing its velocity before coming to a stop.