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Its initial speed cannot be 20 m, as stated in the question. Secondly, if the initial speed is correctly given, then there is no need to calculate it!
This is difficult. We are not told what it is we are to calculate. We are not told how the velocity is changing (which it does, implied by the word "initial"). Suggest re-writing the question.
It refers to the volume of an object at the start of an experiment.
It is a set that you derive from some initial data or formula depnds on the question. I assume you know what a set is?
It means "first". When we talk about a person's initials, we are talking about the initial letters, the first letters, in his or her name, like JFK standing for John Fitzgerald Kennedy.