Final answer:
A trailer is a vehicle designed to be pulled by a truck or car. When a trailer bounces up and down on a highway, it is more likely to be heavily loaded. Option C is correct.
Step-by-step explanation:
A trailer refers to a vehicle that is designed to be pulled by a truck or car. So, the correct answer to the question is option c) Truck or Car.
When observing a trailer bouncing up and down slowly on a highway, it is more likely that the trailer is heavily loaded. This is because the weight of the cargo inside the trailer causes the suspension system to compress and rebound, resulting in the bouncing motion.
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When you see a trailer on the highway, the way it reacts to the road's bumps and its own movement can give you a clue about its load. If a trailer is bouncing up and down slowly, it is more likely that the trailer is heavily loaded.
A heavier load would result in a greater inertia that dampens the spring's oscillations, causing slower bounces. Conversely, a nearly empty trailer has less inertia and therefore, its springs can react more rapidly to bumps on the road, leading to a quicker, possibly choppier motion.