Give an example to support your answer. No, because the car may be turning. A car going a steady 50 miles per hour around a race track would be an example. Distinguish between velocity and acceleration. Velocity is speed and direction.
Acceleration is the rate that the velocity is changing.
Therefore, an object can be accelerating if either its speed or its direction are changing. Other answers are appropriate as long as the time parts are assumed to have a 1 in front of the unit. The car is neither changing speed or direction. No air resistance is to be considered. It represents a rate of change of a rate of change.