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Math Help - PHYSICS---am i doing anything wrong?

  1. #1
    Member Chokfull's Avatar
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    PHYSICS---am i doing anything wrong?

    Starting speed is 30 m/s
    End speed is 15 m/s
    Time elapsed is 3 s
    Find the distance traveled (acceleration is constant)

    the formula they gave me is

    x-x^0=1/2(v^0+v)t

    just pretend the ^0 is below not above, i dont know how to do sub-0 sorry.

    anyway, i plug it all in and get

     <br />
1/2*(15+30)*3=67.5 m<br />

    But the book says the answer is 90 m

    thanks to any1 who helps! i think the book may be wrong, it wouldn't be the first time, but I'd like to be sure.
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  2. #2
    Super Member Matt Westwood's Avatar
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    Quote Originally Posted by Chokfull View Post
    Starting speed is 30 m/s
    End speed is 15 m/s
    Time elapsed is 3 s
    Find the distance traveled (acceleration is constant)

    the formula they gave me is

    x-x^0=1/2(v^0+v)t

    just pretend the ^0 is below not above, i dont know how to do sub-0 sorry.

    anyway, i plug it all in and get

     <br />
1/2*(15+30)*3=67.5 m<br />

    But the book says the answer is 90 m

    thanks to any1 who helps! i think the book may be wrong, it wouldn't be the first time, but I'd like to be sure.
    "am I doing anything wrong?" - yes, taking physics!

    But seriously, if the time were 4 seconds, then yes the answer would be 90m. I reckon the book's wrong, because you're told it's 3 seconds.
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