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How long did this car accelerate

  1. Oct 18, 2007 #1

    I need help with a question i am doing: A car accelerates at 2.4ms^-2 untill it reaches a speed of 16ms^-1 how long did it accelerate for? and what distance did it travel while accelerating? could someone please help me...
  2. jcsd
  3. Oct 18, 2007 #2
    Use Newton's laws and show ur work.(forum rule : Show people the path, don't drive them through).
  4. Oct 18, 2007 #3
    um yeah thats where its gets difficult cuause i dont know how.. im not very good at physics.... mayb u could show me a couple more tips...a few formulas or something
  5. Oct 18, 2007 #4
    k. one of the equation is v = u + at
    where v - final vel.
    u - initial vel.
    a - acceleration
    t - time
    since its not clear(atleast to me) what is the initial vel. you can take it to be zero or report the question is wrong :)
  6. Oct 18, 2007 #5
    ok thank u a lot for your help i also have another question:

    the charge of one electron is -1.6x10^-19 am i correct?

    so if i have a paint particle that carries 1.2 x 10^10 electrons (12000000000)what is the toatal charge it carries: i tried -1.6x10^-19 = -0.00000000000000000016 so i tried
    -0.00000000000000000016 x 12000000000 electrons is this method correct? thanx again
  7. Oct 18, 2007 #6
    To find the time:


    To find the distance:

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