Physics

The case in which the car is balanced is the car with the cruise control set at 80 km/h.

When the cruise control is set at a constant speed (80 km/h in this case), the forces acting on the car are balanced. This means that the driving force (from the engine) is equal to the opposing forces (like friction and air resistance), resulting in a constant speed and no acceleration.

Option A

A car shortly after a stoplight turns green: The car is accelerating, indicating unbalanced forces....