Final answer:
When a trailer is bouncing up and down slowly, it is more likely that the trailer is heavily loaded rather than nearly empty. This is because a heavier load compresses the suspension system and results in a slower bouncing motion.
Step-by-step explanation:
When a trailer is bouncing up and down slowly, it is more likely that the trailer is heavily loaded rather than nearly empty. This is because a heavier load will cause the suspension system of the trailer to compress and rebound more slowly, resulting in a slower and more noticeable bouncing motion.
Additionally, a heavily loaded trailer will have a lower center of gravity, which provides more stability and reduces the likelihood of bouncing. On the other hand, a nearly empty trailer will have a higher center of gravity and less weight, making it more susceptible to bouncing.
Therefore, based on the observation of a slow bouncing motion, it is reasonable to infer that the trailer is heavily loaded.