Final answer:
The opposing force to the car's motion is 5000 N, as it balances out the driving force to maintain constant velocity, in accordance with Newton's first law of motion.
Step-by-step explanation:
The force opposing the motion of a car with a weight of 11,000 N that moves with constant velocity along a horizontal road and has a driving force of 5000 N acting on it, is also 5000 N. This is based on Newton's first law of motion, which states that if an object is moving with a constant velocity (meaning there is no acceleration), then the net force acting on the object is zero. Therefore, the driving force and the force opposing motion (such as friction and air resistance) must be equal in magnitude and opposite in direction to result in this balanced, or equilibrium, state. Hence, the correct answer is A 5000 N.