Final answer:
According to Newton's first law, the truck must have no forces acting on it. Newton's third law also suggests that the truck is in equilibrium.
Step-by-step explanation:
According to Newton's first law of motion, also known as the law of inertia, an object will remain in a state of rest or constant velocity unless acted upon by an external force. In this case, the truck is moving at a constant velocity of 3.0 m/s, indicating that there is no net external force acting on it. Therefore, according to Newton's first law, the truck must have no forces acting on it.
On the other hand, Newton's third law states that for every action, there is an equal and opposite reaction. This means that if there are forces acting on the truck, they would be balanced out by an equal and opposite force. As a result, the truck would be in equilibrium according to Newton's third law.
Learn more about Newton's Laws of Motion