Final answer:
When a small car pushes a large truck, the car slows down while the truck speeds up due to Newton's third law of motion.
Step-by-step explanation:
When a small car pushes a large truck, the car slows down while the truck speeds up.
This is because of Newton's third law of motion, which states that for every action, there is an equal and opposite reaction.
So, when the car pushes on the truck with a certain force, the truck pushes back on the car with the same force in the opposite direction, causing the car to slow down and the truck to speed up.