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Very true - you have to try. Not just 9 and 10 tho...wirte something for every question, a formula, or how you would go about doing it (in english, with words).Best advice I can give though, is look for the clues they give you - "Why is that bit of information important?"..."Why have they out...

"v=+ - root15" perhaps should be v=-root15 as velocity is to the left, which is -ve