2

Based on dictionaries' definitions, the noun "speed" sounds to be either countable or uncountable. So please let me know if in the sentence bellow using the determiner "a" sounds natural to you or what:

2

The 'a' here seems OK (maybe emphatic) but also redundant. At any time, the rock has a single speed. I think grammatically the structure of the sentence is different with and without the 'a', but the meaning is not substantially changed.

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