It means that you are aware and are paying attention.
Answer: In transport economics, the value of time is the opportunity cost of the time that a traveler spends on his/her journey. In essence, this makes it the amount that a traveler would be willing to pay in order to save time, or the amount they would accept as compensation for lost time.
The figurative language is “like a ball”. It’s an simile since he’s comparing the fall to a rolling ball. Well he’s comparing the way he fell like an ball rolling down the stairs.
Subjective mood is used to express wishes, desires, and doubts and unknown or factual situations.
For this question you would tick off the first and last box.
Hope that helps. -UF aka Nadia