Results 1 to 3 of 3

Math Help - distance problem

  1. #1
    Junior Member
    Joined
    May 2007
    Posts
    36

    distance problem

    very hard stuff ..need help please
    Attached Thumbnails Attached Thumbnails distance problem-train.jpg  
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Bar0n janvdl's Avatar
    Joined
    Apr 2007
    From
    South Africa
    Posts
    1,630
    Thanks
    6
    b)  v^2 = u^2 + 2as
     1296 = + (2)(2)(s)
     s = 324

     s = ut + \frac{1}{2} a t^2
     s = ut \ (There \ was \ no \ acceleration)
     s = (36)(90)
     s = 3240

     v^2 = u^2 + 2as
     0 = 36^2 + (2)(-3)(s)
     s = 216

    Add all those distances together and you get: 3780 metres
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Bar0n janvdl's Avatar
    Joined
    Apr 2007
    From
    South Africa
    Posts
    1,630
    Thanks
    6
    c) T2 takes 150s to complete the journey.
    I calculated T1 to take only 118s.

    But they travelled the same distance and route. Im guessing that Train 1 was therefore faster. Maybe it had a bigger average speed.

    d) For T2
    s = 3870
    t = 150
    u = 0
    v = 0
    a = ?

     s = ut + \frac{1}{2} a t^2
     3870 = \frac{1}{2} a 150^2
     a = \frac{43}{125}

     v = u + at
     v = 0 + \frac{43}{125} (150)
     v = 51,6 ms^-1
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. distance problem
    Posted in the Algebra Forum
    Replies: 3
    Last Post: February 25th 2010, 01:35 AM
  2. distance problem
    Posted in the Algebra Forum
    Replies: 1
    Last Post: January 26th 2010, 01:44 PM
  3. distance problem
    Posted in the Algebra Forum
    Replies: 2
    Last Post: February 5th 2009, 05:36 AM
  4. 3d distance problem
    Posted in the Calculus Forum
    Replies: 2
    Last Post: January 30th 2009, 06:52 AM
  5. Distance Problem
    Posted in the Pre-Calculus Forum
    Replies: 1
    Last Post: September 7th 2008, 04:29 PM

Search Tags


/mathhelpforum @mathhelpforum