posted by Matt .
You throw a rock horizontally off a cliff with a speed of 10 m/s. after 3.1 seconds, how far were you when threw the rock?
The question as written is unintelligible. Correct your punctuation and grammar to make it clear just what the conditions are.
Yeah, I know it's a math question, but we have communicate with English, following established rules, if we want to convey information.