Answer:
"There is a net force on the truck" is true about the forces acting on the truck.
Explanation:
When truck is in contact with the road and is moving, several forces acts on the moving truck.
The net force is a sum of the forces that acts in opposite directions and same directions.
When the truck is moving there is a normal force of the road acting upwards which is balanced by the weight of the truck that acts downward.
