Question

A car is moving at a constant speed along a straight line. Which statement is true about the forces acting on the car?

Answer 1

Yes, there is no NET FORCE on the object.

Explanation:

However, there are forces acting on the object.

There is  

friction

opposing the motion of the object, but it is exactly balanced out by a constant force in the opposite direction. Since both forces are balanced, you don't see any slowing down or speeding up as a result and the net force results to be zero - speed is constant.

Since the question doesn't state to ignore friction, friction is assumed to be at play here.

There are also forces acting on the object in the y direction, but those also balance out, and hence, you don't see the object flying off the ground.