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M1 level help

  1. Sep 12, 2007 #1
    Hi.

    I would really appreciate it if someone could please help me with the following M1 level kinematics question as I am really stuck.

    The brakes of a train can produce a retardation of 1.7 m/s^2. If the train is travelling at 100 km/h and applies its brakes what distance does it travel before stopping?

    I got that:

    a = -1.7
    u = 22.8 (when converted to m/s)
    s = ?

    but I do not know where to go from here.

    Thank you.

    Cathy
     
  2. jcsd
  3. Sep 12, 2007 #2

    learningphysics

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    Homework Helper

    Have you studied the different equations for displacement with constant acceleration?
     
  4. Sep 12, 2007 #3
    Just realised that v = 0!

    I have got the answer now! :smile:

    Cathy
     
  5. Sep 12, 2007 #4
    Hi.

    Could someone please help me with the following question? I have no idea how to even start it.

    A particle is moving along a straight line. It passes points A, B and C on the line t = 0, t = 3 s and t = 6 s respectively. If AC is 60 m and the velocity of the particle at A is 4 m/s find the acceleration of the particle (assumed uniform) and the distance AB.

    Thank you.

    Cathy
     
  6. Sep 12, 2007 #5
    Break this problem into parts. You know that from A to C 60m; [tex]v_0=4m/s[/tex] and [tex] t=6s[/tex]
    so you have t, v, and displacement. Do you know of any relationship between those variables?

    Casey
     
  7. Sep 12, 2007 #6
    Thank you so much for your help. I have figured out the answers now. :smile:

    Cathy
     
  8. Sep 12, 2007 #7
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