1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    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!

Velocity and displacement

  1. May 18, 2010 #1
    1. The problem statement, all variables and given/known data

    The acceleration a ms^-2 of a car is given by a=18t - 4 where t is the time in seconds.Derive expressions for the velocity v ms^-1 and the displacement x m if the initial velocity and displacement are both zero

    2. Relevant equations

    3. The attempt at a solution
    would really appreciate any help with this.I have no idea where to start!Trying to get a sample answer so i can study it to past exam paper questions
  2. jcsd
  3. May 18, 2010 #2


    User Avatar
    Homework Helper

    Start with the definition of acceleration:

    acceleration is the rate of change of velocity, so a= dv/dt.

    If you replace 'a' by 'dv/dt' in your equation, can you find 'v'?
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook