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Math Help - linear motion :O help please

  1. #1
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    linear motion :O help please

    a train travelling at 30m/s is at a certain instant 1500m from the station. what is the value of uniform deceleration required for the train to come to a stop at the station

    HELP
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  2. #2
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    Use

    v=u+at

    and

    s=(u+v)t/2

    Since the final velocity v is 0 you get

    30=-at and 1500=30t/2

    You can get t from the second equation and the first equation tells you that a=-30/t
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  3. #3
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    Quote Originally Posted by a tutor View Post
    Use

    v=u+at

    and

    s=(u+v)t/2

    Since the final velocity v is 0 you get

    30=-at and 1500=30t/2

    You can get t from the second equation and the first equation tells you that a=-30/t
    :s :S :s umm im not great on maths what does that mean HELPPPP LOL haha
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  4. #4
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    Are you not familiar with v=u+at and s=(u+v)t/2 ?

    May I ask...
    What course are you studying?
    How's your algebra?


    Anyway I'll finish this problem for you but I won't make a habit of it.

    1500=30t/2

    3000=30t

    t=3000/30

    t=100


    30=-at

    a=-30/t

    a=-30/100

    a=-0.3
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