When a loaded and an empty truck of identical specifications are moving with same velocity, more force is required to stop the loaded truck. Which of the following laws is proved by this action?

Newton's second law (F = ma) explains this - the loaded truck has more mass (m), so at the same velocity, it has more momentum. Stopping it requires more force to produce the deceleration. Newton's first law describes inertia, third law describes action-reaction pairs, and gravitational law governs attraction between masses.