1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

How long did this car accelerate

  1. Oct 18, 2007 #1
    Hello

    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...
    Thanks
    Ryan
     
  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
    thanx
     
  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:

    v=at

    To find the distance:

    ax=½v²
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?