If a car is moving with a constant velocity, it means that both its speed and direction are constant. In this case, the net force acting on the car must be zero.
According to Newton's first law of motion (also known as the law of inertia), an object at rest or in motion with a constant velocity will continue to stay in that state unless acted upon by an external force. In the case of a car moving with constant velocity, the forces acting on the car must be balanced and result in a net force of zero.
There are typically multiple forces acting on a car, such as friction, air resistance, and the force provided by the engine to maintain the constant velocity. These forces must add up to zero for the car to continue moving with a constant velocity.
Therefore, if a car is moving with a constant velocity, the force acting on the car must be zero, or more precisely, the net force is zero.