Final answer:
The resultant force acting on the car is zero since the car is traveling at a constant speed.
Step-by-step explanation:
The resultant force acting on a car can be found using the formula F = m * a, where F is the net force, m is the mass of the car, and a is the acceleration.
Since the car is traveling at a constant speed, its acceleration is zero. Therefore, the resultant force acting on the car is also zero.